Based on both the Harlows' research with rhesus monkeys and the case of Anna, the isolated child, one might reasonably conclude that:

a) the two species react differently to social isolation.
b) both monkeys and humans "bounce back" from long-term isolation.
c) even a few days of social isolation permanently damages both monkeys and humans.
d) long-term social isolation leads to permanent developmental damage in both monkeys and humans.