Which is the most accepted theory of organic evolution?

Which organisms survive in their environment?

Which is the basis of evolution?

Select the appropriate option for the founder effect.

Natural selection can lead to . . . . . . .
$(a)$ stabilisation
$(b)$ genetic drift
$(c)$ directional change
$(d)$ disruption
Choose the correct answer from the options given below:
$(A)$ $(a)$, $(b)$ and $(c)$ only
$(B)$ $(a)$, $(c)$ and $(d)$ only
$(C)$ $(a)$, $(b)$, $(c)$ and $(d)$
$(D)$ $(a)$ and $(c)$ only

The most likely reason for the development of resistance against pesticides in insects damaging a crop is