Final answer:
Muscles work directly with bones to produce movement by contracting and pulling on the tendons that connect them to the bones. option b is the correct answer.
Step-by-step explanation:
The structures in the human body that work directly with the bones to produce movement are the muscles. Muscles are attached to bones by strong cords called tendons.
When muscles contract, they shorten, which pulls on the bones and facilitates movement across a joint. This is how we are able to perform various activities like running or even simple movements such as lifting an arm.
Therefore, the mentioned correct option in the final answer to which structures work directly with the bones to produce movement is b. muscles.