Correct Answer: Rational

Solution : The first option is correct.

Cogent is used for arguments that are clearly expressed and persuade people to believe them.

Rational refers to thoughts that are based on clear thought and logic, making it the correct synonym for the word cogent .

The meanings of the other options are as follows:

• Insane is a state of mind that prevents normal perception.
• Tyrannical means expressing power in a cruel way.
• A coward person is someone who is easily frightened.