The following questions are based on four passages in English to test the comprehension of English language. Read each passage and answer the questions.
This first step is for us to realise that a city need not be a frastrater 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. What we need now are organ systems for recreation, leisure, culture, community expression. This means abundance of open space, easy access to unsploit Nature, beauty in parks and in fine buildings, gymnasia and swimming baths and recreation grounds in planty, central spaces for celebrations and demonstrations, halls for citizens' meetings, concert halls and theatres and cinemas that belong to the city. And the buildings must not be built anyhow or dumped down anywhere; both they and their groupings should mean something important to the people of the place.
Which one of the following has the opposite meaning to the word 'frustrater' in the passage?