You Are Studying the Spore Dispersal Distance in Perfectly Still

You are studying the spore dispersal distance in perfectly still air of two fern species found in your area, and you find that one species has an average dispersal distance many times that of the other, which is much larger than would likely be explained by chance. A reasonable hypothesis would be that your two species consist of a:

A) whisk fern and polypod fern.
B) whisk fern and horsetails.
C) marattiod and leptosporangiate fern.
D) leptosporangiate and polypod fern.