Answer:
A. In pedometer, ped comes from the Latin pedis, which means "foot."
Explanation:
Etymology is the study of the history of words. Basically, you want to find out the origins of the word. Therefore, A is the correct choice as it describes how the word "pedometer" came to be, originating from the Latin word meaning foot. Etymology is not the synonyms, definition, or pronunciation of a word and thus you can rule out B, C, and D.
Overall, either by ruling out choices or by the definition of etymology, A is the correct answer.
If you are trying to remember information that you are reading, you should be an "active" reader, who pays attention to the words and thinks about connections that may occur.
