7278. Deepak employed my friend only when I agreed to avouch for his honesty.

✅ The correct answer is option B.
Vow : a solemn promise.

Affirm : state emphatically or publicly.

Pay : give (someone) money that is due for work done, goods received, or a debt incurred.

Guarantee : something that ensures a particular outcome.

Avouch : affirm or assert.

Synonym of Avouch is Affirm