Comprehensive and Detailed Explanation From Exact Extract:

Given the constraints:

Lowest cost of installation and minimized loss of usable space favor elevators that don't require a separate machine room.

Machine-roomless elevators (D) have compact machinery integrated within the hoistway, reducing space needs and construction costs.

Hydraulic elevators (A, C) require pits and often larger machine rooms, and are less energy efficient and have slower round trip times compared to traction types.

Gearless traction elevators (B) provide excellent speed and efficiency but usually require machine rooms, increasing cost and space.

Thus, machine-roomless elevators balance cost, efficiency, space, and speed best for mid-rise residential buildings.

ARE 5.0 PPD -- Building Systems and Assemblies, Vertical Transportation

The Architect's Handbook of Professional Practice, 15th Edition -- Elevators and Conveying Systems