This type of pulley only changes the direction of the force onlyAmoveable pulleyBfixed pulleyCblock and tackle

The type of pulley that only changes the direction of the force is a B. Fixed Pulley.

Explanation:

1. Fixed Pulley: A fixed pulley is attached to a support and does not move with the load. It changes the direction of the applied force, allowing you to pull down to lift the load upwards. It does not provide a mechanical advantage, meaning the effort required to lift the load remains the same as the weight of the load.

2. Moveable Pulley: This type of pulley moves with the load and can provide a mechanical advantage, allowing you to lift heavier loads with less effort.

3. Block and Tackle: This is a system that uses multiple pulleys (both fixed and moveable) together, which provides mechanical advantage and changes the direction of the force.

In summary, while the fixed pulley changes the direction of the force, moveable pulleys and block and tackle systems provide mechanical advantages in addition to changing the force's direction.