What do I say about this sentence in the exercise paper titled "The public policy battle over the Pebble Mine: Pitting wild salmon against economic development"?

$57\%$ of all wild salmon sold in grocery stores in the United States are harvested in Bristol Bay.

A$.$ This sentence does not support the thesis of the paper.

B$.$ No sentence should begin with a digit; spell it out or re$-$write it so the digit falls inside the sentence.

C$.$ This sentence requires an MLA in$-$text citation.

D$.$ This sentence should be placed inside quotation marks, since it is a direct quotation.