What genotype produces red flowers in the described plant species?

The correct option is the one that indicates homozygosity for the dominant red allele, resulting in the expression of red flowers. In the context of flower color, the allele designations often include capital letters for dominant traits and lowercase for recessive traits.

In this case, "CR" represents a dominant allele for red flower color. For a plant to exhibit red flowers, it needs to have at least one dominant allele from the flower color gene. Therefore, the genotype that consists of "CRCR" means that it carries two copies of the red flower allele, ensuring that the dominant trait is expressed.

The additional allele pair "DRDR" might suggest another characteristic related to flower attributes, but as long as the CRCR genotype is present, the dominant red flower color will be exhibited. Thus, this genotype satisfies the conditions for red flower production.

In summary, the presence of two dominant alleles for flower color (CRCR) leads directly to the red phenotype.