The correct option is C Test cross
A cross between a homozygous plant with recessive traits and a heterozygous plant is known as a test cross. A test cross is a valuable tool in predicting the genotype of the
organism in question. The test cross was introduced by Gregor Mendel and his goal was to discover if the genotype in a homozygous dominant
(AA) or heterozygous (Aa) plant. Since both genotypes produce the dominant phenotype characteristics, it becomes impossible to identify. The test cross is a simple method of discovering the true breeds.