ANS:B - Belt conveyor

The material handling equipment that is not suitable for moving materials in varying paths is the "Belt conveyor." Belt conveyors are designed for moving materials in a straight line or along a fixed path. They are not well-suited for transporting materials in varying paths or around obstacles. The design of a belt conveyor typically involves a continuous loop of belt that moves along a set path, guided by pulleys and rollers. On the other hand:

• Hand trolleys are manually operated and can be maneuvered to transport materials in varying paths.
• Cranes have the ability to move materials vertically and horizontally, and they can be operated to transport materials to different locations within a defined area.
• Trucks are versatile vehicles that can transport materials to various locations, including over uneven terrain and around obstacles, making them suitable for transporting materials in varying paths.