Final answer:
The major advantage of push/pull steering from the low-hand position is enhanced vehicle control and a more stable body position. Hence the correct answer is option A
Step-by-step explanation:
The major advantage of push/pull steering from the low-hand position is enhanced vehicle control because the arms stay close to the body and maintain a more stable vertical body position (a). This allows for better control over the steering and improves stability while maneuvering the vehicle. The other options, (b), (c), and (d), do not accurately describe the advantage of push/pull steering from the low-hand position.