In plotting the relationship between the incidence of breast cancer and the level of vitamin D in the body, we would most likely plot October 4, 2022 by 8i9x6 vitamin D on the Y axis and incidence of breast cancer on the X axis. average daily sunlight on the Y axis and the incidence of breast cancer on the X axis. vitamin D on the X axis and incidence of breast cancer on the Y axis. The three answers above are equally good. See Answer vitamin D on the X axis and incidence of breast cancer on the Y axis.