What is the best testable null hypothesis for the above experiment?
(A) Female butterflies prefer the scent of chemicals produced by males of their own species over the control chemicals.
(B) Female butterflies prefer the scent of the control chemicals over chemicals produced by males of their own species.
(C) Female butterflies cannot sense the chemicals produced by males of their own species.
(D) Female butterflies have no preference for either of the chemicals.

The following study was carried out to examine sexual selection of butterflies. Chemicals believed to be pheromones were isolated from males of certain species of butterfly. An environment was created in which a pheromone-containing droplet was applied to one side of the box and a control drop was applied to the other side. Female butterflies were introduced to the center of the box and given the opportunity to go to either side. The results are shown in the table below.

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# of Butterflies Preferred Side Male chemical side 2,760 Control side 2,240