In polling, the "Bradley Effect" is: Select one:
a. A concept that attempts to explain discrepancies between voter opinion polls and outcomes in elections.
b. A concept that attempts to explain similarities between voter opinion polls and outcomes in elections.
c. A concept that attempts to justify the need of polling ahead of election.
d. A concept that relates to the Democratic US Senator and presidential candidate Bill Bradley.

whats the question? im not quite understanding your question.

answer: the risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

the american civil war was not caused   by slavery but by economic factors.