How Can Stable and Coherent Public Opinion Arise from Unstable

How can stable and coherent public opinion arise from unstable and incoherent individual opinions?

A) Pollsters have developed weighting systems that allow them to identify the most informed respondents so their responses count more.
B) Measurement errors and random individual changes tend to cancel one another out and the average remains the same if the circumstances remain the same.
C) New technologies and platforms have allowed pollsters to draw better samples that reduce the amount of measurement error in polls.
D) It can arise through opinion leaders who canvass their friends and answer polling questions consistently over time.