Mutation

Step 1: Concept
For a trait to influence evolution, it must be inheritable.
Step 2: Meaning
Mutations in somatic (body) cells are not passed to offspring.
Step 3: Analysis
Germplasm (reproductive) cells contain the DNA that is transmitted to the next generation. Mutations in the DNA of these cells provide the raw material for evolutionary change.
Step 4: Conclusion
Evolution occurs due to mutations in germplasm DNA.
Final Answer:(C)

The correct option is (A): Change in one base pair