You're sharp as a tack if you chose C! "Acrimony" is traced back to the Latin word "acer," which means "sharp." You can see a little bit of "acer" in each of the words we've highlighted today. The relationship between "acer" and "acrimony" is pretty obvious. "Acute" comes from the Latin word "acus," which means "needle" and is very closely related to "acer." "Eager" comes directly from "acer," but during its trip through medieval French, it gained the spelling "eger." All of these words also carry a hint of "sharpness" in their meanings: "acrimony" refers to sharp, painful words, thoughts, or actions; "acute" refers to something felt sharply; and "eager" implies that you desire something sharply.