Answer:
Option (B).
Step-by-step explanation:
Gene mutation may be defined as the sudden, inheritable alteration in the DNA sequence of the organism. Mutation may affect the single base pair or may change the sequence of a chromosome as well.
Gene mutations can be neutral, beneficial or harmful depending on the effect of the gene mutation. The beneficial mutation in the organism's environment can be inherited and influence its survival and reproduction, leads to natural selection.
Thus, the correct answer is option (B).