A patient prescribed rasagiline (Azilect) for Parkinson's disease asks you how this drug will ...

A patient prescribed rasagiline (Azilect) for
 
  Parkinson's disease asks you how this drug will help his disease. What is your best response?
  a. This drug works by increasing the amount of dopamine activity in the brain and reducing tremor and muscle rigidity to improve movement.
  b. This drug works by allowing a larger amount of levodopa to reach the brain, which raises dopamine levels in the brain.
  c. This drug works by blocking cholinergic nerve impulses that help control the muscles of the arms, legs, and body.
  d. This drug works by helping provide a more stable, constant supply of levodopa, which makes its beneficial effects last longer.