7.
Your Answer is
Correct Answer is A
Explanation
sweat dripping from my chin "sweat dripping from the cheeks" is a whole, which is another sentence adverbial, which needs to be separated from the previous adverbial by a comma, A is correct.
Item B/C: overalls spattered with pulp "overalls were spattered with pulp" as a whole as a sentence adverbial, there can be no commas in the middle.