How is sound produced by using pipel wind instruments​

May someone explain how to do this question?

For waves in the ocean, the medium of the waves is a. air b. water c. energy d. a passing boat

Select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air