PLEASE HELP A gardener plants several flowering plants of the same species and notices that about 10% of the plants produce larger flowers than the others. He keeps track of the distribution of flower sizes over several years as shown in the table below. What explains these observations?

1st Year 2nd Year 3rd Year 4th Year 5th Year
Large flower trait 10% 25% 40% 50% 62%
Small flower trait 90% 75% 60% 50% 38%
A. Random chance led to the distribution of flower sizes.
B. Overproduction of offspring resulted in more offspring deaths of the plants with smaller flowers.
C. Speciation occurred because variation was present in the population.
D. Natural selection occurred, causing a shift in the distribution of traits within a species.
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