Question

(CAN SOMEONE PLEASE HELP?!)
The gene for seed shape in pea plants has two alleles, resulting in either smooth or wrinkled peas. A pea plant with one smooth allele and one wrinkled allele produces only smooth peas. Based on this information, which conclusion can be drawn?

A. Both alleles are co-dominant.
B. One allele is incompletely dominant.
C. The allele for smooth seeds is recessive.
D. The allele for wrinkled seeds is recessive.