[quote="SajjadAhmad"]A person can develop or outgrow asthma at any age. In children under ten, asthma is twice as likely to develop in boys. Boys are less likely than girls to outgrow asthma, yet by adolescence the percentage of boys with asthma is about the same as the percentage of girls with asthma because a large number of girls develop asthma in early adolescence.
Assuming the truth of the passage, one can conclude from it that the number of adolescent boys with asthma is approximately equal to the number of adolescent girls with asthma, if one also knows that(A) a tendency toward asthma is often inherited
(B) children who develop asthma before two years of age are unlikely to outgrow it
(C) there are approximately equal numbers of adolescent boys and adolescent girls in the population
(D) the development of asthma in childhood is not closely related to climate or environment
(E) the percentage of adults with asthma is lower than the percentage of adolescents with asthma
The argument mentions that "the percentage of boys with asthma is about the same as the percentage of girls with asthma" by adolescence, for that to be true, the number of boys needs to be equal to the number of girls in the population (at least approximately). Hence Option C is the best pick. The others are irrelevant and out of scope.