Answer:
C. Facts and habits are important to think about.
Step-by-step explanation:
This sentence introduces all of the key points in the next sentence and prepares the reader for what they are about to read. It is like saying "This is what I am stating, and here is why" in two sentences.
And, they fit well together, as you can see here:
"Facts and habits are important to think about. You learn facts that can be helpful (math, cause and effect, vocabulary, history), you learn habits that can be helpful (making deadlines, how to schmooze teachers), and you learn by analyzing examples of creative thought."
Other sentences won't work as well as this one.
Hope this helps! Have a nice day!