Choose the most appropriate word to fill in the blank:

Ravi is _____ at solving difficult crossword puzzels.

ingenious

The correct answer is Option (2) → ingenious

• Ingenious: (Adjective) Having or showing cleverness, inventiveness, and originality. This fits the context of expertly solving complex puzzles.

• Ingenuous: (Adjective) Innocent and unsuspecting; naive. (Incorrect fit)

• Inherent: (Adjective) Existing in something as a permanent, essential, or characteristic attribute. 

• Inimical: (Adjective) Tending to obstruct or harm; hostile.