Chitra, a Neuron, Has Been Sending Offensive Messages to Neighboring

Chitra, a neuron, has been sending offensive messages to neighboring neurons. The neighbors decide to "perform surgery" to eliminate Chitra's transmissions. This could be achieved most effectively by

A) locking the gates on Chitra's axon.
B) reducing the strength of Chitra's action potentials.
C) decreasing Chitra's refractory period.
D) placing a myelin sheath on Chitra's axon.