During the Building of the London Subway System in the Late

During the building of the London subway system in the late 1800s,a species of aboveground-dwelling mosquito expanded its distribution to include the underground tunnels,where it successfully lived and bred.In the late 1990s,scientists comparing the two groups of mosquitoes discovered that they are now different species.The most likely mode of reproductive isolation for these two species is

A) ecological isolation.
B) temporal isolation.
C) behavioral isolation.
D) mechanical isolation.
E) gametic isolation.