Which of the following best explains why deforestation increases the risk of floods in an area?
a. tree leaves catch and retain rain water.
b. trees block the free flow of water.
c. deforestation increases precipitation.
d. tree roots improve soil water retention.

It's to know your purpose before you read something because a purpose can:

Match the element of fiction with its definition. match term definition plot a) conveys a message or truth about life setting b) acts to overcome obstacles conflict c) establishes an order of events character d) contributes to the mood theme e) builds the tension between or within characters

Which would be the most appropriate type of document for the situation