Mrs. Brownie wants to gather information about having a school dance. To get valid and unbiased results, which survey method should she use?
A.
Survey the first 30 students who walk into the building on Monday morning
B.
Have the computer randomly generate a list of students at her school to answer her survey
C.
Ask each homeroom teacher to select 3 students to answer her survey
D.
Post a link to her survey questions on the her eclass page