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 slightly different flight patterns in courtship.
C) Males from one population are slightly larger than males from the other population.
D) All of the above are correct.
E) None of the above is correct.