In a Two-Factor Experiment with 2 Levels of Factor a and 2

Multiple Choice

In a two-factor experiment with 2 levels of factor A and 2 levels of factor B,three of the treatment means are essentially identical and one is substantially different from the others.What result(s) would be produced by this pattern of treatment means?

A) A main effect for factor A
B) A main effect for factor B
C) An interaction between A and B
D) The pattern would produce main effects for both A and B, and an interaction.