Contextual Clues - 4 (Gapped Paragraph)

Directions: Complete the given paragraph by selecting the most appropriate answer from the given options and fill blank (2).
Some people feel ________ (1) by brain teasers, while others figure them out quickly. The difficulty of many brain teasers relies on a certain degree of _________ (2) in human intuitiveness. It often requires thinking in unconventional ways with given __________ (3) in mind.