The accuracy of polling is diminished when respondents select one: a. give what they regard as the socially correct response. b. are asked about familiar issues. c. have an opinion and reveal it. d. admit they are not familiar with an issue and offer no opinion. e. none of these answers is correct.

a. give what they regard as the socially correct response.

Explanation:

A poll is a survey in which a group people are asked about their opinion on a particular matter and it is used to try to understand what most people think using a representative sample. For a poll to be accurate, it is needed that people express what they truly believe about a topic. Because of that, the answer is that the accuracy of polling is diminished when respondents give what they regard as the socially correct response as they are not actually saying what they really think which affects the result of the poll.

answer; functional fixedness;

answer: marginal utility of the fourth brownie is 0.

explanation: marginal utility is the addtional utility gained from the consumption of one more unit of a good. it is given by,

so, marginal utility at the 4th unit will be given by

since, the values are not given here, you can simply find marginal utility at fourth unit by subtracting total utility at 3rd unit from total utility at 4th unit.