Which Would Be the Best Way to Directly Test the Hypothesis

Which would be the best way to directly test the hypothesis that C.stellatus (a species of barnacle) is competitively excluded from the lower intertidal zone by B.balanoides (another species of barnacle) ?

A) Place individuals of each species in a jar and see which species survives.
B) Remove all B.balanoides from the lower intertidal zone.
C) Transplant B.balanoides to the upper intertidal zone.
D) Clear rocks in an entire area and document recolonization events.
E) Remove all C.stellatus from the upper tidal zone.