In the past efforts to clean up oil spills have included which methods a. mopping and recapturing b. spreading detergent and soaking c. vacuuming and burning

The correct answer is C.
In the older times, any effort to deal with an oil spill in the ocean included a suction skimmer to collect the oil from the water surface and the oil was burned on site. A suction skimmer is attached to a vacuum unit or a pump and it is ideal when there is a large amount of oil to be collected. On-site burning was used to carefully get rid of the oil.

Aneutral atom must have the same number of neutrons and protons? no, they must have the same number of protons and electrons