How does the euphemism "under the weather" affect the meaning of this sentence?
the mayor cancelled the news conference because she was under the weather.
the euphemism evokes more sympathy than a more straightforward phrase would evoke.
the euphemism adds sarcasm and casts doubt on the mayor’s claim.
the euphemism explains the purpose of the news conference better than a more straightforward phrase would.
the euphemism politely masks any unpleasant details of the mayor’s illness.

The answer to your question would be that the euphemism in the sentence politely masks any unpleasant details of the mayor's illness.

Explanation:

The term "euphemism" refers to polite, indirect expressions that replace words and phrases considered harsh and polite, or which suggest something unpleasant. The fact is that it is not necessary to know the details of the mayor's illness if he/she is not dealing with a severe disease. Therefore, the euphemism avoids the inclusion of any detail.