The principal of a school asked all 7th grade students, "Would you prefer to add pizza or hamburgers to the lunch menu?" Everyone surveyed had to choose one of the two choices. The survey showed that 38% prefer to add hamburgers. Choose all of the statements that are valid conclusions based on the data.

A - all of the students at the school prefer pizza to hamburgers

B. 62% of the 7th grade students at the school prefer to add pizza

c. 38% of all of the students at the school prefer to add hamburgers

D. all of the 7th grade students at the school like pizza and hamburgers
0.38% of the 7th grade students at the school prefer to add hamburgers