Correct Answer: alleviate

Solution : The first option is correct.

• Let's look at the meanings of the given word and the marked option:
  • Aggravate : make a problem, injury, or offence worse or more serious.
  • Alleviate : make suffering, deficiency, or a problem less severe.
• Let's look at the meanings of the other given options:
  • Irritate : make someone annoyed.
  • Exasperate : irritate, and frustrate.
  • Integrate : combine one thing with another so that they become a whole.

Therefore, the correct answer is alleviate.