The correct answer is: A. surface is moistened.
Static electricity is a build-up of electrical charge on an object. It can be caused by friction, such as when you rub your feet on the carpet. When you touch something, the static electricity can discharge, causing a spark.
Rubber and flat leather are both good insulators, which means they do not conduct electricity well. This makes them more likely to build up static electricity.
Moistening the surface of rubber or flat leather can help to prevent static electricity from building up. This is because water is a conductor of electricity. When the surface is moistened, the static electricity can flow through the water and dissipate.
The other options are not as effective at preventing static electricity. Conductive dressing and oil compound dressing can help to conduct electricity, but they are not as effective as water. Talcum powder is not a conductor of electricity, so it will not help to prevent static electricity.
In addition to moistening the surface, there are other things you can do to prevent static electricity. You can wear shoes that do not generate static electricity, such as rubber-soled shoes. You can also avoid touching objects that are likely to generate static electricity, such as computers and televisions.