The correct answer is C). Interest groups are not nominating candidates, that is the work for parties. Parties want to win elections because they are seeking the control of the government while interest groups are looking to gain the public and to inform them about everything that is happening.
Interest groups want to influence public policy and that is the major difference between those two.
The questionnaires are a cheap and quick and the effective way to obtain large amounts of information form a large sample of people. As they are open and closed type they give the respondent enough time to think and respond and are beneficial for the quantitative and the qualitative data.
