In an attempt to determine the favorite sport of people in the city, marcos surveys every tenth person exiting a basketball game. which statement is most likely true?

a. the survey could be biased because basketball fans might favor basketball over other sports.
b. the survey could be biased because only every tenth person was surveyed.
c. the survey should be unbiased because every tenth person was systematically chosen.
d. the survey should be unbiased because basketball fans are like all sports fans.