The first step is for us to realize that a city need not to be a frustrater of life, it can be among other things, a mechanism for enhancing life, for producing possibilities of living which are not to be realized except through cities. But, for that to happen, deliberate and drastic planning is needed. Towns as much as animals, must have their systems of organs - those for transport and circulation are an obvious example.
Which one of the following has the opposite meaning to the word 'frustrater' in the passage ?

Options

A. Applauder
B. Approve
C. Executor
D. Promoter