Answer:
I think its A. It allows the playwright to make mistakes without anyone noticing.
Explanation:
Let's break this sentence down:
Harry's father is Seattle's wealthiest citizen.
- Prepositional phrases: There are no prepositional phrases since there is neither a preposition nor an object altogether.
- The subject is <em>Harry's father.</em>
- The verb within the sentence is<em> is</em>.
- There is one complement in the sentence which is subject compliment: <em>Seattle's wealthiest citizen.</em> Remember that subject complements give us more information about the subject and they usually occur after linking verbs (seem, be, become) and, in this sentence, the subject complement is preceded by the verb <em>is.</em>