Two organisms that are true-breeding for a certain genetic characteristic are mated and their offspring were analysed. Which of the following statements about this situation is correct?

• A. Both parents are homozygotes.
• B. The offspring are either all homozygotes or all heterozygotes.
• C. The offspring represent the \[{{F}_{1}}\] generation and the gametes produced by the offspring will carry only one allele for this gene.
• D. All of the above