A student has a group of corn plants with long stalks, and a group of corn plants with short stalks. She crosses the long stalk and short stalk plants. The resulting generation of corn plants all have short stalks. Based on this experiment, what can the student determine about the alleles for stalk length? A. Short stalks must be recessive, because the short stalk trait was hidden in some of the offspring.

B. Short and long stalks are both dominant, because both traits were present in the parent plants.

C. Short stalks must be dominant, because the short stalk trait covered up the long stalk trait in the offspring.

D. Long stalks must be dominant, because the long stalk trait was present in one of the parent plants.