If Levodopa Therapy Is Not Improving the Clinical Manifestations of a Client

If levodopa therapy is not improving the clinical manifestations of a client who has Parkinson's disease,the nurse anticipates that the client may be changed to another antiparkinsonian drug,such as

A) Methyldopa (Aldomet) .
B) Haloperidol (Haldol) .
C) Lithium carbonate (Lithane) .
D) Amantadine (Symmetrel) .