The correct answer is A) start to load slowly. The reasoning for this is that starting to load slowly helps to reduce the accumulation of static electricity during the loading of petroleum products. Slow loading allows the static charge to dissipate gradually, preventing a sudden discharge that could create a spark and potentially ignite the vapors. The other options are incorrect because they do not directly address the issue of static electricity accumulation - increasing air flow or using a specific loading method does not necessarily mitigate static electricity in the same way as starting the loading process slowly.