Which statement best captures the primary conceptual distinction between a one-factor ANOVA and a two-factor ANOVA with interaction?

One-factor ANOVA tests one factor's main effect

Two-factor ANOVA tests two factors' main effects without interaction

One-factor ANOVA tests interactions

Two-factor ANOVA tests only main effects

One-factor ANOVA tests one factor

Two-factor ANOVA tests both factors and their interaction.

One-factor ANOVA compares two groups

Two-factor ANOVA compares more than two