Is the absence of knowledge of the outcome of an event before it happens. a. return b. diversification c. uncertainty d. certainty

sulfur dioxide

explanation: acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. these substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

2%? i tried finding the exact sorry if it's not 100% correct ; -;