Explanation:

When a heterozygous individual is crossed with a homozygous dominant parent, it is called an outcross.

Monohybrid Cross:
A monohybrid cross is a cross between two individuals that differ in only one trait. In this type of cross, the parents are usually heterozygous for the trait being studied. However, in the given question, the cross is not between two individuals differing in only one trait, so it is not a monohybrid cross.

Test Cross:
A test cross is a cross between an individual with an unknown genotype and an individual with a known homozygous recessive genotype. This cross is used to determine the unknown genotype of the individual. In the given question, the cross is not between an individual with an unknown genotype and a known homozygous recessive individual, so it is not a test cross.

Reciprocal Cross:
A reciprocal cross is a pair of crosses between a male of one strain and a female of another strain, and vice versa. This cross is used to determine if the sex of the parent affects the inheritance pattern. In the given question, there is no mention of the sex of the parents or the strains involved, so it is not a reciprocal cross.

Outcross:
An outcross is a cross between two unrelated individuals. In the given question, the heterozygous individual is crossed with a homozygous dominant individual, which is unrelated. This type of cross is called an outcross.

In conclusion, the correct answer is option B, outcross.

When f1 generation (heterozygous) is crossed with dominant parent then it is called out cross.
for example, Tt -f1 generation is crossed with TT.