What is the "employment-at-will" doctrine? what are the exceptions to this doctrine

The three major common law exceptions are public policy, implied contract, and implied covenant of good faith. ... The most widely recognized common law exception to the at-will presumption protects employees against adverse employment actions that violate a public interest.

220+18=238
the total amount of fruits is 238

Ithink the answer is c i hope it my friend message me if i’m wrong and i’ll change my answer and fix it for you