Here, this execution depends on less waiting time. So, the process which would have less waiting time that would take place after completing first process which would take less time to complete bcz if that less time taking process executes first then the waiting time for second process will be less and that second process will be executed effectively and without any hurdle after termination of first one.
The inference is that we know that CPU bound process takes less execution time with no waiting time( if only one cpu bound process is available) and gets in execution easily also. So, The less execution time would be, the less time second process will have and that second process will be executed without any context switch or wait.
This is very efficient way that a processor can have in this condtion. So, Answer is (A).