Explanation:

Correct option 2: B

The error is in part (B).

Corrected sentence: "She went for lunch at 1 p.m. and then returned."

The phrase "went for the lunch" is incorrect here. In general usage, we say "go for lunch" (without "the") unless referring to a specific, pre-identified lunch (e.g., the lunch we discussed earlier). Since this is a general reference, "the" should be omitted.

So, the correct answer is part B.