Verbal Analogies

 The relationship is that of a furnace and the item that is produced or made in a furnace. Oven: Cakes is the closest option.

Impetuous means rash or hasty, while caution is carefulness - they are opposites showing lack vs. presence of a quality. Similarly, excessive means too much while moderation is the quality of being moderate or controlled - they show the same opposite relationship. Arduous:easy, impassive:diligent, and ingenuous:fake don't show this clear opposite pairing.

 The relationship is of a product and the raw material used to make the product. Thread is made of cotten, like noodles are made of flour.

 Portfolio is the total holdings of the securities. Likewise, classroom:students bear the same relationship.

 The relationship is that of an action and a noun which is destroyed by that activity. E.g, embezzling breaks trust.  

All the other options are adverbs whereas defensive is an adjective.

Paraphernalia refers to equipment or accessories, while belongings refer to personal possessions. Both describe items that belong to someone or are associated with a person, making them similar in meaning.

A connoisseur is someone who expertly appreciates art, so 'a lover of art' describes what a connoisseur is. The question asks which pair is related, and B-D shows the definition relationship.

Rubicund means having a healthy red color, while pallid means pale or lacking color. These are clear opposites describing complexion, making A-B the correct answer as claimed. The other words (Griandiose likely a typo for Grandiose, and Capricious meaning unpredictable) do not form clear pairs.

GEM : TURQUOISE represents a category-to-specific-type relationship - turquoise is a specific type of gem (and is named after its color). Similarly, VIOLET : FLOWER represents a specific type of flower. The other options don't show this relationship: lettuce is a type of plant, not specifically defined by being green; pears are not oranges; magnetta is not a standard stone type; cherries don't define vines.

WINE : GRAPES represents a product-to-source-ingredient relationship. Wine is made from grapes. Similarly, VODKA : POTATOES shows vodka is made from potatoes. The other options don't fit: liquor isn't necessarily intoxicating (that's a property, not source); whiskey isn't primarily made from hops (it's grain-based); champagne isn't typically made from raisins; vineyard and winery are related places, not product-source.

Forensic relates to debate in formal argumentation contexts. Just as histrionic (overly theatrical) relates to drama. Both pairs show a domain with an adjective describing its characteristic performance style.

A conduit is a channel that carries water. An artery is a vessel that carries blood. Both represent 'transport mechanism : contents flowing through it'.

An antimacassar is a protective cloth placed on a sofa headrest. A rug is a covering placed on a floor. Both represent 'protective/ decorative covering : surface it covers'.

The relationship between the lead words is that of risk taker and wage-earner. The best answer among available options represents the relationship between earnings by risk-taker and earnings by wager.