Which is the most common and accurate way to measure public opinion

I’m annoyed but glad that my history teacher left and quit her job as a teacher to become a flight attendant

This chart shows american troop strength during what conflict? a) gulf war b) korean war c) vietnam war d) world war ii

What ideas, institution, and causes became the focal points of chinese and islamic resistance respectively to the west in the latter half of 19th century and the first decades of the 20th