The answers is problem and solution
Answer:
He orders the bins in the store-shed to be filled with sand, hidden beneath a layer of grain and meal, and then shows them to Mr. Whymper.
Explanation: He wanted to fool him into thinking that the farm has plenty of food.
This opens the scene/describes what will happen. This is best done without giving a plot overview.
There is not a valid answer choice, but go with sentence 3 because C is always right