Because the subject of a composition is like a crystal with many facets, you should
a. be very critical of your sources.
b. offer your reader ideas from several sides.
c. pick one point of view and stay with it.
d. offer a positive idea for every negative one.
Because the subject of a composition is like a crystal with many facets, you should "a. be very critical of your sources" since some sources can be misleading and often detrimental.