In CSS, font names containing spaces (like Times New Roman) must be enclosed in double or single quotes to be valid. Multiple fonts are separated by commas. Option 6387 correctly uses quotes for the multi-word font and provides a generic fallback (serif) without trailing semicolons inside the value string.

The CSS 'color' property specifically controls text color (foreground color). Option A 'text-color' doesn't exist in CSS. Option B 'foreground-color' also doesn't exist - though it sounds logical, CSS uses the simpler 'color' property name. Option C 'background-color' controls the background, not the text. 'color' is the standard, correct property for text color in CSS.

CSS style rules follow the syntax 'selector { property: value }' where the selector targets HTML elements, properties and values are separated by a colon (not equals sign), and the declaration block uses curly braces { }. Options B and D incorrectly use '=' instead of ':'. Options C and D use parentheses instead of curly braces, which is incorrect CSS syntax.

In CSS, an ID selector (e.g., #header) is used to target a single, unique element on a page. Class selectors are used for groups of elements, and element selectors (tags) are used for all elements of a specific type. IDs have higher specificity than classes.

A CSS declaration consists of a property and its associated value. The correct term is 'Declaration' but option C uses 'Deceleration' which appears to be a typo/spelling error. However, this is clearly the intended answer. Option A 'Tag' refers to HTML elements. Option B 'Attribute' refers to HTML name-value pairs. Option E shows a complete CSS rule, not a single declaration. Option D is nonsensical filler.

In HTML syntax, 'attribute' is the correct term for the name='value' pairs inside element tags. The blank in '

' represents where the attribute name goes, followed by = and its value in quotes. A 'selector' is a CSS concept for targeting elements. A 'property' is CSS terminology. 'Declaration' is also CSS terminology referring to property-value pairs within style rules.