Answer:
the answer is "D". Park
Step-by-step explanation:
Automatic transmission fluid is a oil use in vehicles to keep the gears working normal.
Checking the Automatic transmission fluid (ATF) with the engine running is necessary to warm up the fluid so that the original level of the fluid is picked correctly when using a dipstick or a rod, hence the reason for normal operating temperatures.
Virtually, nobody can check a vehicle at motion because a vehicle only move at First, second, third, to fifth gear. the temperature of a moving vehicle increases as the engine works. A normal temperature is needed to check the ATF, and the best time recommended is before moving the vehicle (immediately after starting the engine).
Therefore, the best gear position recommended for checking automatic transmission fluid is at PARK.