Scaling laws are a. general engineering guidelines for miniaturization b. useful for estimating how the characteristics of something will vary with changes in characteristic dimension c. estimates of a device's performance at the nanoscale d. accurate predictors of physical characteristics at the macro-, micro-, and nanoscales

c is the answer : )               your welcome

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.