B) Honest mistake
It’s important to note that words can have a negative connotation, and they can have a positive connotation. When we look at all the possible answers, all of them actually have negative words within them. However, only one of them (Option B) has a positive word—“honest.” Thus, out of all answers, Option B is the least negative because “honest” sort of balances out the negative connotation word, “mistake.”