In some experiments there is no control group. For example, respondents are asked their attitudes towards a politician. Then they are shown that politician's campaign ad. The respondents are then again asked their attitudes towards the politician. What type of experiment is this? Selected answer will be automatically saved. For keyboard navigation, press up/down arrow keys to select an answer. a One shot case study b Longitudinal study c One group pretest-posttest d Pretest-posttest control group