Predicted winner in an election for town mayor

Question

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Method C: Telephone 100 randomly-chosen voters who live in the town. 54 percent plan to vote for the incumbent mayor.
Method D: Telephone 70 people who have lived in the town for more than 25 years. 45 percent plan to vote for the incumbent mayor

Which method best represents the whole population of the town’s voters.

Answer 1

What do you think?

Answer 2

Method C? It's seems to be less biased since it's randomly chosen

Answer 3

Yes, C.