Which of the following statements about autosomal recessive traits is true?
A. If neither parent expresses the trait, but the offspring does, both parents must be heterozygous for the trait.
B. If an individual expresses the trait, then all of his or her offspring will also express the trait.
C. If an individual expresses the trait, none of his or her offspring will express the trait.
D. Only females can pass the trait to their offspring.