Fill in the blank with the most suitable word from the given options:-

It would be ____ to refuse such a generous offer.

churlish

The correct answer is Option (3) → churlish

Churlish means rude, difficult, ungracious, or grumpy. In this context, it suggests that refusing a generous offer would be ungracious or ill-mannered. 

• Chivalrous: Means courteous and gallant, especially toward women; honorable. (Opposite of the intended meaning.)

• Chary: Means cautiously or suspiciously reluctant to do something. (While one might be chary of an offer, refusing it would not be described as chary.)

• Coquettish: Means behaving in a way that suggests a playful sexual attraction; flirtatious. (Irrelevant to the context of refusing an offer.)