Which of the Following CANNOT Be Said of the Interaction

Multiple Choice

Which of the following CANNOT be said of the interaction in a study?

A) It can be determined by examining a graph of the results.
B) It can be determined by investigating marginal means.
C) It can exist even if the main effects are not significant.
D) It is almost always more important than a study's main effects.
E) There are multiple types of interactions (e.g., crossover interaction) .