bio help! will mark brainliest
which of the following is an example of prezygotic isolating mechanisms?

a. two strains of rice produce a hybrid, which can produce fertile offspring, but its offspring is small and sterile.

b. a horse and a donkey may interbreed, but the offspring, a mule, is not fertile.

c. the sperm of species A dies when It comes in contact with the female reproductive tract of species B.

d. two salamander species mate, but the offspring does not complete development and dies.

I think its b, but I'm not too good with stuff like this. So I thought I'd get a second opinion (and an explanation?). thank you tons!