Topic: Transformation of Sentence,

Best Answer Explained in Below-:

The phrase "He had to suffer for his sins" indicates an obligation or a necessity tied to the consequences of one’s actions. To interpret this in a negative sense implies a sense of inevitability or lack of alternative options regarding suffering for those sins. Among the provided options, “D) He could not but suffer for his sins.” best captures this notion.

The expression "could not but" denotes that there are no other choices or paths available—suggesting that suffering is the only possible outcome due to past actions. It encapsulates an unavoidable fate, aligning with the original context of suffering as a consequence of one's sins.

In contrast, options A and B indicate a sense of choice or other potentialities. Option C (“He is not but suffer”) is grammatically awkward and doesn’t convey the intended meaning effectively. Thus, option D stands out clearly as the most accurate reflection of the original sentiment that emphasizes the inescapable nature of suffering as a direct result of one's misdeeds.