Read these sentences from the text:

"Infected bats seem to run out of fat in the middle of winter. Bats need that fat to nourish themselves until spring. Without it, they die. [ ... ] Normally, hibernating bats wake briefly once or twice a month, Kunz says. Infected bats arouse from hibernation every four or five days. They then expend valuable calories flying around."

Based on this evidence, what conclusion can be drawn about the infection?

The infection is most likely an effect of bats flying around in the middle of winter.

The infection most likely causes bats to wake up during hibernation.

The infection is most likely found in bats with a lot of fat.

The infection is most likely found in bats that are already sick.

The correct answer is B. The infection most likely causes bats to wake up during hibernation.

Explanation

According to the fragment of the question, the author said that bats need fat to feed during the hibernation from winter to spring, also they "wake up briefly once or twice a month". On the other hand, the author said "Infected bats seem to run out of fat in the middle of winter", also they "wake up from hibernation every four to five days", and "expend valuable calories flying around" According to the above, the conclusion that can be drawn about the infection is the infection probably causes bats to wake up during hibernation, because only infected bats have an abnormal hibernation cycle, also, this might be associated to the low rate of fats that are found in infected bats.