"More than 38 million children and adolescents participate in organized sports in the United States each year."
Which describes how the direct quotation is improperly cited?
The sentence is not correctly punctuated.
It does not credit the source in the sentence.
The thought is incorrectly paraphrased.
It is a summary and does not need to be cited.
Your answer is D., because when you use quotation marks, that is mean that it is cited, but it is not giving where it was cited, so since it WASN'T cited, there is no need for quotation marks, which makes it your answer as D. I hope I helped! =D