The answer is 'glossary'. It is usually found at the end of the book and is a list of the technical terms used throughout the book.
Answer:
A
Explanation: the other three are either irrelevant or have already been answered in the text.
Let's identify the reason why Mary cries when sick according to her age.
If Mary is an infant, she's crying because she probably wants water.
If Mary is an adolescent, she probably wants her Ma.
If Mary is an adult, she cries when she's sick because she is tired.
So, how old is Mary?
It is a verb because it is an action, something you did.
