Answer:
A. To entertain.
B. To inform.
Step-by-step explanation:
Expository writing is used to explain, describe or inform about something the author knows.
The creator of this type of writings must assume that the reader doesn´t know anything about the subject he is explaining so he must use clear language and made the paper entertain to allow the reader to understand it properly and not be bored by the explanation.
I hope this answer helps you.