Read the text and answer the question.
Natural forces can be both helpful and harmful. For example, wind can be used to produce electricity, but it can also become a dangerous storm. Similarly, rain is necessary for living things, but too much rain can cause floods. Understanding these forces helps us get ready for disasters and use them for our benefit.
What is the main idea of the text?
A)Natural forces are always harmful.
B)Natural forces have both positive and negative sides.
C)Wind is the most powerful natural force.
D)Rain is more important than wind.