What Evidence Led Ruth and Sessions to Conclude That Parasites

Multiple Choice

What evidence led Ruth and Sessions to conclude that parasites could be the cause of some of the deformities in the frogs found in the ponds of Northern California?

A) None of the deformed frogs found in the ponds were infected with the parasites.
B) They directly observed the parasites causing the deformities.
C) Glass beads placed near the location of limb development in tadpoles mimicked the effect of parasites and caused deformities.
D) Deformities in the frogs occurred in nature but not in the laboratory.