Correct Answer: rude

Solution : The fourth option is the correct answer.

"Courteous" refers to being polite, considerate, and showing good manners in one's behaviour. On the other hand, "rude" implies a lack of politeness, displaying discourteous or impolite behaviour, and disregarding social conventions.

The meanings of other options are as follows:

• Modest refers to having a humble opinion of oneself.

• Humble implies having a modest or low view of one's importance.

• Polite is a synonym for courteous.

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Therefore, the correct answer is rude.