Ready to believe

The correct answer is A. Credulous.

Credulous means easily persuaded to believe something, especially something unsound or false.

B. Credible means believable or trustworthy.
C. Creditable means worthy of praise or respect.
D. Incredible means too extraordinary or improbable to be believed.

Credulous is the best answer because it is the most closely related to the meaning of the question, which is “ready to believe.” The other options