Stimulus: Residents are worried that population increase may threaten the recreation areas in the city's center. Mayor’s office claims that it is not.
What we need to strengthen is the claim of mayor’s office.
Claim: such growth will not threaten the existence of any of these (recreation areas in the city's
center).
We need a piece of information that will support this claim.
A. By attracting more new citizens, Dorthhampthon's municipality will be able to increase its budget for the development of recreation areas.
This answer choice doesn’t clarify what will happen with the recreation areas in the center. We are not sure whether increased budget will be spent on the recreation areas in the center. It can very well be spent on moving this area to the suburbs.
B. Dorthhampthon's municipality intends to increase the city's jurisdiction, allocating new areas for parks and recreation in its surroundings.
Since this answer choice talks about suburbs, but not the center, it is irrelevant.
C. Dorthhampthon's ratio of park area per resident is about half that of similar cities in the region.
We don’t know whether this ratio will be maintained or improved or worsened because of population increase.
D. The new housing projects in central Dorthhampthon are planned to replace lower buildings in older complexes.
If new housing projects don’t require additional land area, but replace old buildings, then there is no threat for the recreation area in the center. Hence D strengthens the claim and explains what the mayor’s office meant.
E. Annual population increase of 6 percent a year poses a significant challenge to the city's infrastructure.
The claim is weakened to some extent now.
Hence
D