A city newspaper was conducting an online survey, which did the following asks: "What is the nation's top priority for f

[answerhappygod]

A city newspaper was conducting an online survey, which did the
following asks: "What is the nation's top priority for fighting gun
crime?" There were 892 responses --- 64% said the toughest laws;
14% said that the ban on the pistols; 12% said more police and
better law enforcement; and 10% said more social programs against
poverty.
a) What was the variable measured in this survey?
b) What is the population of interest?
c) What type of sampling is this?
d) Explain (briefly) any possible source of bias in the
survey.