In the following sentence the highlighted part contains an error. Alternatives to the highlighted part are given as options. Select the correct alternative.
Yesterday was the worse day of my life.

Correct option is B

The correct answer is (b) worst.
Explanation: “Worse” is a comparative degree used to compare two things. Here, the sentence refers to “the day of my life” — superlative degree is appropriate, hence worst.
Grammatical rule used: Use superlative form (worst) with “the” when talking about the most extreme in a group or time.
Example: That was the worst movie I’ve ever seen.