Concept:The antonym of a word is its opposite. Resilient means able to recover quickly or bounce back from difficulty.Explanation:Resilient describes something strong and adaptable. Fragile means easily broken or damaged, which is the direct opposite. The other options are: Tough (strong, not opposite), Buoyant (cheerful or floating, not opposite), Flexible (bendable, a synonym in some contexts). Only Fragile gives the contrary meaning.Answer:C. Fragile