Which statement is true about supporting details in a text?

a.

supporting details should be either facts or expert testimony, but not explanations or definitions.
b.

supporting details in expository texts serve a different purpose than supporting details in narrative text.
c.

it may be necessary to read through a text more than once to identify the details that support or develop the main idea.
d.

the purpose of supporting details is to support the reader’s curiosity until the main idea is revealed.