Which Statement About Duggins's Urchin Removal Experiments Is True

Which statement about Duggins's urchin removal experiments is true?

A) Kelp was abundant in both the urchin-excluded and the control treatments at the start of the experiments.
B) Kelp did not become established in the control treatment.
C) Kelp did not become established in the urchin-excluded treatment.
D) Urchins died in the control treatment due to the presence of kelp.