Four students did a survey to find the soda flavor sixth-grade students prefer. the table below shows the method each student used to conduct the survey: student method trey asked 100 students at random from his seventh-grade class what their favorite soda flavor is jesse asked 100 sixth-grade students at random what their favorite soda flavor is nita asked 100 eighth-grade students at random what their favorite soda flavor is ruben asked 100 third-grade students at random what their favorite soda flavor is which student's survey not biased?