Correct Answer: Credulous

Solution : The correct choice is the third option.

Cynical refers to a mindset or attitude where someone tends to distrust others' motives, expecting that people are primarily motivated by self-interest or are generally insincere.

Its antonym is credulous as it refers to a tendency to believe or accept something with a readiness that might exceed what is reasonable or justifiable.

The meanings of the other options are as follows:

• Scoffing means treating something with scorn, mockery, or derision.
• Incredulous means unwilling or unable to believe something, showing scepticism.
• Sceptical means having doubts or reservations about something, showing a cautious attitude towards beliefs or claims.