How are scientific polls better to conduct than "people-in-the-street" interviews (aka straw polls) or opt-in internet surveys? a

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How are scientific polls better to conduct than "people-in-the-street" interviews (aka straw polls) or opt-in internet surveys?

a. Scientific polls offer more questions; the greater the number of questions, the more accurate the results.

b. Scientific polls select subjects randomly; this prevents biased samples and results.

c. Scientific polls are quicker; faster polls reduce respondent fatigue and allow more people to be polled.

d. Scientific polls are significant cheaper than polls conducted by private organizations, like news networks