Darren decided to conduct market research for a new streaming service. He showed half of participants an ad for the streaming service with a $12.95 per month subscription fee and the other half the same ad with a $14.95 subscription fee. He then asked participants to rate the likelihood that they would subscribe from a scale of 1 (not at all likely) to 10 (extremely likely). The dependent variable in this experiment is: a. the ad b. the per month subscription fee c. the likelihood rating of subscribing d, the streaming service e. there was no dependent variable