Emma consumes only hot dogs and hamburgers. She is at her consumer equilibrium. Hot dogs and hamburgers have the same marginal utility. Thus
选项：

A: her total utility from all the hot dogs eaten must be the same as her total utility from all the hamburgers eaten.
B: the price of a hot dog and the price of a hamburger must be the same.
C: she must be eating the same number of hot dogs and hamburgers.
D: Both answers B and C are correct.