If Kant's Anthropocentric View Is Correct,then Using Animals in Horrifically

If Kant's anthropocentric view is correct,then using animals in horrifically painful medical experiments would be:

A) permissible even if the experiments were done for no good reason.
B) permissible even if the experiments were not useful.
C) impermissible under any circumstances.
D) permissible as long as the experiments served human needs.