Correct Answer: mitigate

Solution : The correct choice is the first option .

Alleviate means to make something more bearable or lessen the intensity of a situation. Mitigate means to reduce or ease the severity or impact of something. it is the closest in meaning to alleviate, which makes it the correct synonym.

The meanings of the other options are as follows:

• Aggravate means to make something worse or more severe.
• Irritate means to provoke annoyance or a reaction.
• Agitate means to disturb or excite.

Therefore, the correct answer is "mitigate".