If acid is splashed on your skin wash it once with
a) soap
b) oil
c) weak base
d) plenty of water

  D) PLENTY OF WATER

Explanation:  First of all , all precautionary measures must be taken in order to prevent any kind of accidents.

If by any chance, acid is splashed on your skin, then you should first and foremost was it with plenty of water.Strong bases react with the oils in your skin to produce a soapy feeling layer.

Rinse until well after that feeling is gone.

b i think it’s a water wheel turning in a stream

- "the choice that is not an indicator of a chemical change is "state of matter changes". more common than not, chemical reactions produce energy in the form of light or heat. along with energy, they also produce a new substance called the product that could be in any state of matter (solid, gas, or liquid)."