3. Select the paragraph that best helps develop the central idea of the text stated in
paragraph 1.
A "The people who had exercised were better at separating or distinguishing between the
different memories, say the scientists writing in the Proceedings of the National Academy of
Sciences." (paragraph 7)
B "The scientists also kept track of the participants' mood changes. With exercise you do get a
enhanced mood. The question is whether that was explaining the effect we got on the
behavior or the effect we got on the brain, and it wasn't,' said Yassa." (paragraph 9)
C "The authors of the paper are currently using the same method to look at the effects of light
exercise on older people over extended periods of time." (paragraph 11)
D "Encouraged by the results, Yassa and his team have changed their habits in the lab. 'I try to
do walking meetings every now and then, and we try to get up every couple of hours and go
for a nice 10-minute walk. Based on my experience, not only is the group more productive,
but we're happier," he said." (paragraph 13)