Two Species of Flour Beetles, Tribolium Castaneum and Tribolium Confuum

Two species of flour beetles, Tribolium castaneum and Tribolium confuum, are competing according to the Lotka‒Volterra equations. If the α of T. confuum on T. castaneum is 0.4, one can assume that the addition of 200 T. confuumi individuals would depress the population growth of T. castaneum by the same amount as the addition of _______ T. castaneum individuals would.

A) 0
B) 40
C) 80
D) 200