You Conduct an Experiment Is Which You Compare the Effects

You conduct an experiment is which you compare the effects of three levels of stress on aggression. The mean aggression scores are as follows (higher numbers indicate more stress) : Low stress = 2.5; Moderate Stress=5.0; High Stress= 6.5. You conduct a one-way analysis of variance (ANOVA) and find a statistically significant F-value. You can correctly conclude that

A) high stress caused more aggression than moderate stress, which in turn caused more aggression than low stress.
B) your study found no relationship between stress and aggression.
C) your study found that there is some kind of relationship between stress and aggression but you cannot specify which condition differed from any other condition without additional analysis of the data.
D) there is a relationship between stress and aggression but you cannot determine whether it is causal.