In locations with oil and grease build-up, what is the best lane position?

Answer: A — Center of the lane

In locations with oil and grease build-up, the best lane position is the center of the lane. This is because oil and grease usually accumulate in the wheel tracks left by cars. Riding in the center of the lane provides more space on either side, reducing the chances of sliding on slippery substances. The left and right parts of the lane may have a higher concentration of oil and grease, making them less safe for riding over in these situations. Being close to the shoulder can also be risky as it may increase the likelihood of encountering debris or loose gravel. Therefore, the center of the lane is the safest choice in areas with oil and grease build-up.