In Figure 25

In Figure 25.21 the researchers measured a clam's ability to burrow as an indicator of paralysis due to inhibition of a Na⁺ transporter by saxitoxin.Which of the following would occur in sensitive clam cells that have been exposed to saxitoxin?

A) Na⁺ ions would no longer be able to leave a neuron by facilitated diffusion
B) Na⁺ ions would no longer be able to leave a neuron by active transport
C) Na⁺ ions would no longer be able to enter a neuron by active transport
D) Na⁺ ions would no longer be able to enter a neuron by facilitated diffusion