Long-term governments should not be changed lightly <span> dictate that Governments long established should not be changed for light and transient causes.</span>
This answer depends on the city in question.
B is the most all encompassing answer as all other options are examples of a city administrator.
Some cities vest the parks, trails, etc with the Public Works department. Other cities put it under the Director of Parks and Recreation.
Others have a manager for public lands.