A proverb is a short saying that states a general truth or advice. They're popular as they are told and retold through generations, incorporated in books and stories that grandparents narrate to children. Proverbs have a deeper meaning than the one you perceive at first. The given proverb is an advice that says if something doesn't need improvement, don't try improving it; it may end up being worse. This is given in B, hence option B is correct. Options A and C are vague in meaning and do not explain the proverb correctly. Option D is similar in meaning, but it focuses on not wasting time, whereas the proverb focuses on avoiding something from being ruined further. Hence options A, C, and D are incorrect.