To manually rotate the LM 2500 GT engine, you should use which of the following tools?

Correct Answer: Option B — A socket wrench with an 18-inch long 3/4-inch drive extension.

The LM2500 manual rotation tool requires a 3/4-inch drive extension to handle the torque necessary to turn the rotor assembly safely. Using a 1/2-inch drive would risk tool failure or snapping the extension under the load required to overcome the engine's internal friction and inertia during maintenance procedures.