Answer:
B. The reaction rate decreases
Step-by-step explanation:
Increasing the pressure on a reaction involving reacting gases increases the rate of reaction.
Changing the pressure on a reaction that involves only solids or liquids has no effect on the rate.
If you increase the pressure of a gas, you squeeze it into a smaller volume
Greater density of molecules increases the number of collisions. When you decrease the pressure, molecules don't hit each other as often and the rate of reaction decreases.