This suggests bats pose more risk to other bats than to other animals, such as humans. This is consistent with the author’s position, which is that we don’t have much justification to remove all bats from buildings with people.

(B) gives us reason to think that rabid bats are likely to bite more often than other bats, which means that the general tendency (”rarely bite”) pointed out by the author does not apply to rabid bats. This undermines the support provided by that premise.

This has no clear impact. Most animals with rabies could be raccoons, weasels, rats, etc. This doesn’t suggest that rabid bats are more likely to bite people than normal bats, or that there’s something about bats that should justify removing them from buildings.

If anything, this might support the author’s position by eliminating the possibility that the most rabid bats live in buildings, which might otherwise give us a reason to remove bats from buildings.

This has no clear impact. If people are more likely to be aware of being bitten by a bat in a building, that doesn’t suggest we might want to remove bats from buildings.