- "there is little justification for health warnings that urge the removal of any bats residing in buildings where people work or live."
The premises supporting this conclusion appear in the first and last sentences:
- "Almost all cases of rabies in humans come from being bitten by a rabid animal, and bats do carry rabies."
"Bats are shy animals that rarely bite, and the overwhelming majority of bats do not have rabies."
The reasoning here relies on bats being shy and not having rabies, and on that basis indicates that we need not worry about removing them from buildings where people work and live.
Answer choice (B) weakens the argument by showing that bats in people-inhabited buildings present a certain type of problem. Namely, when any animal (including bats) become rabid, they not only stay near where they are (which would be buildings) but become far more aggressive. If this is the case, the wisest course of action would be to remove now what could be a future source of serious problems. that idea weakens the argument, and thus (B) is correct.