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read this excerpt from "just one in four young teens meet us fitness guidelines" by lindsey tanner and answer the question that follows:

young teens aren't exactly embracing the government's let's move mantra, the latest fitness data suggest.

only 1 in 4 u. s. kids aged 12 to 15 meet the recommendations — an hour or more of moderate to vigorous activity every day.

the results are based on about 800 kids who self-reported their activity levels and had physical exams as part of the 2012 national youth fitness survey.

government researchers won't call the results disappointing, but lead author tala fakhouri of the centers for disease control and prevention said, "there's always room for improvement."

the cdc released partial results wednesday from the fitness survey, which involved kids aged 3 to 15. other results from the same survey are pending and include fitness data based on more objective measures including treadmill tests.

fakhouri said the nationally representative results provide useful information for initiatives that aim to increase kids' fitness, including the let's move anti-obesity campaign launched by first lady michelle obama in 2010.

lindsey tanner. "just one in four young teens meet us fitness guidelines." 08 jan. 2014: n. pag. ap images. web. 17 jan. 2014.

based on this excerpt, the information in this article would be most useful in answering which of these research questions?

a. why are physical fitness programs necessary for improving student health?
b. how many types of physical activity should students participate in each day?
c. how much time do researchers spend evaluating student health and wellness?
d. why do students enjoy some physical activities more than others?