From a pharmacology standpoint, which statement best explains why levodopa is superior to dopamine? ...

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Rationale 1: Levodopa can cross the bloodbrain barrier, but dopamine cannot. Levodopa administration leads directly to dopamine synthesis.
Rationale 2: Levodopa does not have fewer side effects.
Rationale 3: There is no risk for addiction from either substance.
Rationale 4: Route of administration is not a factor.
Global Rationale: Levodopa can cross the bloodbrain barrier, but dopamine cannot. Levodopa administration leads directly to dopamine synthesis. Levodopa does not have fewer side effects. There is no risk for addiction from either substance. Route of administration is not a factor.