At a summer camp, 6-year-olds are in Group A, 7-year-olds are in Group B, and 8-year-olds are in Group C. Is the group assignment a function of age? If so, is the function one-to-one or many-to-one?

A. yes; many-to-one
B. yes; one-to-many
C. yes; one-to-one
D. no; it is not a function of ag