The third class lever is one of the three types of levers, with the other two being the first class and second class levers. In a third class lever, the effort is applied between the fulcrum and the load.

Explanation:
A lever is a simple machine that consists of a rigid bar or rod that rotates around a fixed point called the fulcrum. The three classes of levers are distinguished by the relative positions of the fulcrum, the effort (the force applied to move the lever), and the load (the object being moved).

In a third class lever, the fulcrum is located at one end of the lever, while the load is located at the other end. The effort, or the force applied to move the lever, is applied between the fulcrum and the load. This means that the effort is closer to the fulcrum than the load.

Example:
One common example of a third class lever is a pair of tweezers. The fulcrum is located at the joint where the two arms of the tweezers meet, the load is the object being picked up or pinched, and the effort is applied by squeezing the arms of the tweezers together. The closer the force is applied to the fulcrum, the greater the mechanical advantage of the lever.

Advantages and disadvantages:
Third class levers are designed to increase speed and range of motion, but they do not provide as much force as first or second class levers. This means that more effort is required to move a given load compared to the other two types of levers. However, the increased range of motion can be advantageous in certain situations, such as in sports or in delicate tasks that require precision.

In summary, the correct answer is option A, the effort is applied between the fulcrum and the load, in a third class lever. This arrangement allows for increased range of motion but requires more effort compared to other types of levers.