Amphibian occurance:
A) The LD-50 of Spotted Salamanders is less than that of Wood Frogs.
B) The chloride concentrations in ponds where the spotted salamander is absent are well below the LD-50 of the salamanders for chloride.
C) The chloride concentrations in ponds are above the LD-50 of all amphibians studied.
D) Claims A and B are supported by the data.
E) Claims A, B, and C are supported by the data.
