Aresearcher conducted a survey to determine whether people in a certain large town prefer watching sports on television to attending the sporting event. the researcher asked 117 people who visited a local restaurant on saturday, and 7 people refuse to respond. which of the following factors makes it least likely that a reliable conclusion can be drawn about the sports-watching preferences of all people in the town?

a) sample size
b) population size
c) the number of people who refused to respond
d) where the survey was given