Which of the Following Is the Best Definition of Sympatric

Multiple Choice

Which of the following is the best definition of sympatric speciation?  

A) Species that evolve due to geographical distance
B) Mechanical isolation acts to prevent speciation
C) Breeding behavior that prevents the organisms from breeding due to differences in their breeding time
D) Ecological isolation
E) Divergence within a population leads to speciation in the absence of a physical barrier to gene flow.