Which of these hypothetical scenarios are examples of pleiotropy?

A. A single gene determines the size and color of a plant's flowers.
B. A defect in a single gene causes a disease in which affected individuals have longer limbs and vision problems.
C. A single gene determines whether or not an individual is color blind.
D. A defect in a single gene causes a disease in which affected individuals have longer limbs.
E. Multiple genes determine the skin color of an individual.

Pleiotropy is defined as "when a single gene affects two or more phenotypic characteristic of an organism.". Phenotypic refers to the traits that can be physically observed or measured in an organism, for example height, hair color etc. So the examples of pleiotropy in the given options are in A and B which describe situations where one gene affects two or more phenotypic traits.

I hope this answer helps.