Concept:The question tests the ability to choose the correct antonym of the underlined word so that the meaning remains natural in the sentence.
Explanation:The underlined word is “rigid.”
A rigid person is strict, unbending, and unwilling to change opinions.
The required opposite must therefore describe someone who is open-minded and accepting.
Wary means cautious or watchful, so it does not fit.
Critical means judgemental or fault-finding, so it is not the opposite here.
Apprise means to inform, so it is completely different in meaning.
Tolerant means accepting views, beliefs, or behaviour that differ from one’s own.
A tolerant person is the opposite of a rigid and inflexible person.
Therefore, the correct word to fill the gap is tolerant.
Answer:D. tolerant