The second alarm circuit hadn't been connected up at the time.
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.
