The correct answer is: Its Latin origin describes a harsh flavor, while its current meaning describes a harsh manner.
This is the best choice because the Latin word "acerbus" indeed refers to something that is harsh or bitter in taste, which aligns with the original sensory meaning of "acerbic." Over time, the word has evolved to describe a type of sharpness or harshness in tone or manner, particularly in communication—indicating criticism or sarcasm. Thus, both the original and current meanings convey a sense of harshness.