[Solved] Which of the following experimental plans to test the effects of pressure on a reaction with gases

Which of the following experimental plans to test the effects of pressure on a reaction with gases and what is the expected result? 

1. Keep pressure constant and decrease the temperature of the reaction; reaction rate will decrease .
2. Keep pressure constant and increase the temperature of the reaction; reaction rate will decrease.
3. Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.
4. Keep temperature constant and decrease the pressure of the reaction; reaction rate will increase.

The answer is option 4. Keep temperature constant and increase the pressure of the reaction; reaction rate will increase.