I’m gonna say it’s b because none of the other ones make any sense
C) topic
Usually you do not repeat the title in the paragraph it is normally the topic. When you repeat the topic it is when you need to remind the reader what you are talking about or how something relates to what is happening.
Mustufa ran the 100-meter and 200-meter races (but the one he had trained for the hardest was the 400-meter competition).
This is the only answer that is grammatically correct. Parentheses cannot just be place anywhere in a sentence. They are used to add extra information for clarity or information that is an aside). An aside is something that is not the main part of the discussion. In this sentence, the main point is that Mustufa ran the sprint races. The extra information is that he trained for the mid-distance race.
Over 200 people are employed at our local supermarket.
I hope this is what your looking for!