Final answer:
The protein dynein is responsible for generating force that allows microtubules to slide past one another, which is crucial for the movement of cilia and flagella in cells.
Step-by-step explanation:
The protein responsible for generating force as microtubular proteins slide past one another is B) dynein. Dynein, along with another motor protein called kinesin, are motor proteins known as ATPases that use the energy from ATP hydrolysis to power intracellular motility, including the movement of cilia and flagella. This process is crucial for cell motility, allowing the sliding of microtubules past each other, resulting in the bending of structures like cilia and flagella. These actions are essential for the movement of cells themselves or structures within the cells, making dynein a vital component in cellular dynamics.