Hydrangea plants of the same genotype are planted in a large flower garden. Some of the plants produce blue flowers and others pink flowers. This can be best explained by which of the following?

The knowledge that multiple alleles are involved.

The allele for blue hydrangea is completely dominant over the allele for pink hydrangea.

The alleles are codominant.

Environmental factors such as soil pH affect the phenotype of flower color.

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