A political research assistant randomly selects 100 voters to predict the outcome of the upcoming Presidential election. He determines from the data that 53 participants will be voting for the incumbent President. 28 voters will be voting for a relatively unknown candidate, and 19 voters are undecided. Why are the results likely to be erroneous?

AThe results are too varied among the 100 voters.

BThe sample size should not include undecided voters.

CThe sample size is probably more biased because it is so small.

DThe population of all voters is huge when compared to the sample size.