Which of the following is a correct example of a second-class lever?

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Second-class levers have the load between the pivot and the lifting force. Standing on tiptoes fits this: the pivot is the ball of the foot where it contacts the ground, the load is the body’s weight acting between that pivot and the Achilles-tendon pull, and the calf muscles apply the lifting force at the heel. Because the load arm is closer to the pivot than the effort arm, a smaller muscle force can move a larger weight, giving a mechanical advantage that allows you to raise your body onto your toes.

Other options illustrate different lever arrangements. For example, in elbow flexion during a curl the effort is between the pivot and the load, which is a third-class lever with less mechanical advantage; rotations of the neck and similar neck-pivot actions are first-class arrangements where the pivot lies between the load and the effort.