Here's a problem to solve: Morning glories are plants that have a large amount of variation in the genes for flower color. When a white flower appears in a population independent of the trait for white flower color, what is the most likely source?

Among the 4 following options, which is the correct answer?

- A: genetic mutation
 
- B: selective breeding
 
- C: genome duplicating
 
- D: sexual recombination
 