The Dog is the subject in this sentence
There are too many pigs in the blanket to count. So many they can barley fit under the blanket.
C seems to have the best answer, as alliteration has the same sound at the beginning/or starts with the same letter. Example in the sentence; "sly serpent" and "Standing steadfast". Hope this helps!
It would be easier if you provided an excerpt. Anyway I think that the right answer is C.. She is not the fastest runner in the race..