The international community may begin to doubt the credentials of the largest democracy in the world.

Answer: Option B

Unreliable : not able to be relied upon.
Trustworthiness : the ability to be relied on as honest or truthful.
Principles : a fundamental truth or proposition that serves as the foundation for a system of belief or behaviour or for a chain of reasoning.
Capacity : the maximum amount that something can contain.
Credentials : evidence of authority, status, rights, entitlement to privileges, or the like, usually in written form.

Synonym of Credentials is Trustworthiness