The correct option is B Coevolution
The evolution of complementary adaptations in two species caused by the selection pressures that each exerts on the other is called co-evolution. It is common in symbiotic associations, for example- many insect-pollinated plants have evolved flowers whose shapes, and colours make them attractive to particular insects, at the same time the pollinating insects have evolved sense organs and mouth parts specialized insects have evolved sense organs and mouth parts specialized for quickly locating and extracting nectar from particular species of plants.
So, the correct answer is Co-evolution.