Final answer:
The MRI machine is the complex tool among the given options, as it combines multiple technologies, which contrasts with the simplicity of a pulley, lever, or hammer.OPTION D
Step-by-step explanation:
The question is asking to identify which among the given items is a complex tool. A complex tool is defined as a tool that integrates two or more simple machines. The options are: A. pulley, B. lever, C. hammer, and D. MRI machine. The pulley, lever, and hammer are considered simple machines.
The pulley changes the direction of a force without changing its magnitude, the lever is a rigid bar pivoted at a fulcrum used to lift or move loads, and a hammer requires a large effort force to act over a large distance.
On the other hand, an MRI machine is indeed a complex tool because it incorporates various technologies such as superconducting magnets, radio waves, and advanced computer systems to create detailed images of the inside of the body. Therefore, the correct answer is D. MRI machine.