Provide or serve as clear evidence of.

• A. Demonstrating
• B. Verifying
• C. Attesting
• D. Proving

Answer: (C)

Attesting means bearing witness to the truth or validity of something, often by providing formal evidence or certification. When you say something attests to a fact, you are providing clear evidence that the fact is true, or certifying its authenticity. Demonstrating is about showing how something works or presenting examples to make it evident, which is broader and not the same as giving formal evidence of truth. Verifying focuses on checking correctness or truth, a process of confirmation rather than the act of providing evidence itself. Proving aims to establish truth beyond doubt, a stronger claim than simply providing clear evidence. So the best fit for “Provide or serve as clear evidence of” is attesting.