I would say the first answer is correct, because she first left the house, but then had to go back because she forgot her books.
The actions are linear - we have one action that happened first, and was followed by another later action.
the answer to Question one is C, the answer to 2 is C, The answer to 3 is A, The answer to 4 is D.
POGGERS
Answer: Were.
Explanation: When its more than one, you use were is sentences like this, and was when its just one.
The answer is, "Sometimes the desire to have it all makes some decisions very difficult."
