Coiling of shells can vary for snails. Snails that coil to the left cannot mate with snails that coil to the right. This difference leads to reproductive isolation. What kind of reproductive isolation

Coiling of shells can vary for snails. Snails that coil to the left cannot mate with snails that coil to the right. This difference leads to reproductive isolation. What kind of reproductive isolation does this example indicate?

a.mechanical isolation

b. postzygotic isolation

c.gametic isolation

d.behavioral isolation