The most critical aspect of monitoring and controlling is that you are able to make changes as you go. Thus, option (a) is correct.
What is controlling?
Controlling is the managerial function which refers to the measurement of the actual performance with that of the standard performance to take the corrective actions in case of any deviation in the performances.
Monitoring and controlling ensures the changes to be made in the way of doing the particular job. The most important component of monitoring and regulating is the capacity to make adjustments as you go. Therefore, it can be concluded that option (a) is correct.
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Your question is incomplete, but most probably the full question was….
a. make changes as you go
b. anticipate and prevent changes
c. create documentation about project initiation
d. wrap up projects efficiently