The correct answer is B. was. Dollars are considered a singular unit here in the U.S. and thus follow the was/is rule.
So, Colton has problems remembering because he crams before the test: he should probably change this habit, and do the "opposite" of cramming: study <span>a little every day.
Actually, studying a little bit every day is shown to give better results that a lot at once, even if the total time is shorter! </span>
<span>A. When is not answered.
(You could also argue that E: Where is not answered, although it is implied that it will be done nationally)
The sentence tells Who: The National Cereal Corporation, What: a free picture book, Where: Nationally, and Why: to promote reading</span>
