Frictional Force Problem

In the situation above, after block 1 comes to rest, the force exerted on the rope must be equal in magnitude to
A. Zero
B. the frictional force on block 1
C. the vector sum of the force on block 1 due to the friction and tension in the spring
D. the sum of the weights of the two blocks
E. Shiang doesn’t care, he just wants to sleep
F. the difference in the weights of the two blocks