No improvement or correction is required
B. The punctuation belongs outside of the parenthetical citation.
“Although his cheeks were turning a crimson red color, Sanha got through the torture of doing four laps.”
Answer: D or C (depends on your pov)
Explanation: because Labor Day is a public holiday or day of festivities held in honor of working people.
The answer is B) because the subject of a sentence is a person place or thing or a idea you can find the subject of a sentence once you find the verb Hope This Helps:)