Lin is running in an election to be president of the seventh grade. She wants to predict her chances of winning. She has the following ideas for surveying a sample of the students who will be voting: 1.Ask everyone on her basketball team who they are voting for.
2.Ask every third girl waiting in the lunch line who they are voting for.
3.Ask the 15th student that arrives at school one morning who they are voting for.

Which of the samples would produce the most unbiased, representative data? (also plz explain)