What Is the Difference Between Cross- and Self-Fertilization

Multiple Choice

What is the difference between cross- and self-fertilization?

A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant.
B) In cross-fertilization the pollen from one plant is used to fertilize the egg from the same plant.
C) In self-fertilization the pollen from one plant is used to fertilize the egg from another plant.
D) In cross-fertilization insects are used to pollinate the plants, whereas in self-fertilization the investigator pollinates the plants.