Correct Answer: Rational

Solution : The fourth option is the correct choice.

Incoherent describes something that lacks logical consistency, while rational denotes clarity and logical reasoning, making them antonyms in this context.

The meanings of the other options are as follows:

• Gloomy means dark, dim, or pessimistic in outlook.
• Apparent means clearly visible, understood, or obvious.
• Pensive means engaged in deep thought or contemplation.