Which is an example of a compare-and-contrast text structure?

a: cinquain poem differs from a diamante poem in the number of lines and the approach to subject matter.

b: the first step to writing a cinquain poem is to choose a one-word subject to use as the first line.

c ; if having trouble writing poetry, begin with an easier format such as cinquain or diamante

d : it is best to write a diamante poem for the class project because its format fits the subject matter well.