Final answer:
The speed of nerve impulse conduction is determined by axon diameter, temperature, and myelin sheath presence, but not resting membrane potential.
Step-by-step explanation:
The speed of nerve impulse conduction is determined by several factors, but the four options are given in the question itself. Out of the given options, the speed of nerve impulse conduction is determined by A) Axon diameter, B) Temperature, and C) Myelin sheath presence. The correct answer, therefore, is D) Resting membrane potential.