Homogeneity of variance would be something you would need to check for which of the following studies (click one)?

A. The discovery of factors underlying a scale development

B. How well age (continuous) can predict working memory (WAIS-score on Working Memory Index - continuous)

C. How many people appreciated the movie Star Trek

D. Whether watching a video on environmental concerns (vs. a generally funny video) had an effect on people selecting to take home optional reading materials on the environment (measured as number of brochures taken)