You have two processes， P1 and P2 on you computer. You notice that when you execute both the process at a time， process P2 always times out， while if you pause process P1， process P2 starts running fine. Process P1 runs in "Real Time" priority and uses twelve threads while process P1 runs in "Normal" priority and uses one thread. What should you do to solve this problem？ （）

A. Increase the number of threads for process P2.
B. Increase the priority for process P2.
C. Decrease the number of threads for process P1.
Decrease the priority for process P1 to ’Normal’.