The correct answer is Dad fixed the car. In the first sentence, it is mentioned that the car broke down so it couldn't move at all. In the second sentence, it is mentioned that they reached the store an hour later which means that during that time the problem was solved so the car could move. This is the most logical answer since adding other options would need the presence of more information for them to be viable.
I've always been told check for <em>spelling errors </em>first, which technically you are beginning the process of proofreading.
Next, I've been told to look for usage errors, which means, did you use the word in the correct context.
Then I believe you look for grammar mistakes, which includes subject verb agreements, fragments, punctuation, and can include style of the paper, which I believe looks at the sentence variety.
Hopefully this helped and good luck.
All of them except c.
Essays are not considered literature.
Creating tension will immerse the reader into the story and evoke emotions that will allow him or her to relate to the characters. It also helps to build up to the climax.