A Storm Brings Two Formerly Separated Populations of Beetles Together

Multiple Choice

A storm brings two formerly separated populations of beetles together.They look very similar.Under the biological species concept,which of the following would show that the two populations are different species?

A) One population breeds in spring,the other in fall.
B) Males of the two populations have different flight patterns in courtship.
C) When individuals from the two populations mate with each other in the laboratory,the eggs fail to hatch.
D) All of the above are correct.
E) None of the above are correct.