- Levers are simple machines consisting of a rigid bar that pivots around a fixed point called the fulcrum. Forces are applied to the lever: the effort (the force applied by the user) and the load (the force exerted by the object being moved or worked on). - Levers are classified into three classes based on the relative positions of the fulcrum (F), the load (L), and the effort (E). - Class 1 Lever: F is between E and L (E - F - L or L - F - E). Examples: seesaw, crowbar. - Class 2 Lever: L is between F and E (F - L - E). Examples: wheelbarrow, nutcracker, bottle opener. - Class 3 Lever: E is between F and L (F - E - L). Examples: tweezers, fishing rod, forearm lifting a weight. - The question asks for a second- class lever. In a second-class lever, the Load is always located between the Fulcrum and the Effort. - Option A's description ("Fulcrum at one end, Load in the middle, Effort at the other end") matches the configuration of a Class 2 lever (F - L - E). - Option B describes a Class 3 lever (F - E - L). - Option C describes a Class 1 lever (E - F - L or L - F - E, specifically F in the middle). - Option D's description is identical to Option A's. Without seeing the sketches, we rely on the description provided in the options. Assuming Sketch (a) corresponds to the description in A and is a visual representation of F- L-E, then A is correct.