Final answer:
Cross refers to an experiment in which gametes come from different flowers of the same individual.
Step-by-step explanation:
The term cross refers to an experiment in which option C is true: The gametes come from different flowers of the same individual. In cross-pollination, the pollen grains from the anther of one flower are transferred to the stigma of another flower of the same plant. This process is important for genetic diversity and allows for new combinations of traits.