Answer: C) a hint to help you remember the word’s meaning.
Explanation: a memory aid is a clue, a word, or a phrase that helps us to remember something in a easier way. In the given sentences, we have the definition of the word "personnel" which means "employees" and then we have the memory aid "Nel is an employee", "Nel" is a name but also it is the last syllable of the word "personnel" so it gives us a hint to remember the meaning of that word.
