A production involves three major steps as depicted below:

Step 1 (3 mins cycle time) --------------> Step 2 (2 mins cycle time) ------->Step 3 (5 mins cycle time)

Assuming the effective capacity of this process is 20 units per hour

What is the utilization rate? (considering the capacity of the entire process is the capacity of the bottleneck)

A. 100%

B. 60%

C. 125%

D. 50%