Ready to believe

A. Credulous

B. Credible

C. Creditable

D. Incredible

Answer: Option A

Solution(By Examveda Team)

One word substitute is Credulous.

Credulous: having or showing too great a readiness to believe things.
Credible: able to be believed
Creditable: (of a performance, effort, or action) deserving public acknowledgement and praise but not necessarily outstanding or successful.
Incredible: impossible to believe.