An object is said to be in simple harmonic motion (SHM) if

• A.the acceleration is directly proportional to the displacement and is directed toward the equilibrium position of the object
• B.the acceleration is inversely proportional to the displacement and directed toward the equilibrium position of the object
• C.the displacement is directly proportional to the momentum and directed toward the equilibrium position of the object
• D.the momentum is directly proportional to the displacement and directed toward the equilibrium position of the object