Which of the Following Support the Hypothesis That Na⁺ Transport

Which of the following support the hypothesis that Na⁺ transport is affected by saxitoxin?

A) Human cells are resistant to saxitoxin while clam cells are sensitive to saxitoxin
B) Clam cells transformed with the mutated form of the Na⁺ transporter were more resistant to saxitoxin
C) Removing Na⁺ from the clams makes them resistant to saxitoxin
D) Human cells are sensitive to saxitoxin while clam cells are resistant to saxitoxin
E) Na⁺ ion concentration did not affect uptake of saxitoxin by clam cells