Question

which sentence or sentences have correct parallel structure?
leonardo da vinci, who was a painter, sculptor, and scientist, is perhaps best known for his painting the mona lisa.
leonardo da vinci, who was a painter, a sculptor, and a scientist, is perhaps best known for his painting the mona lisa.

Explanation:

Parallel structure requires consistent grammatical form in a list. In the first sentence, the list "painter, sculptor, and scientist" uses consistent singular noun form without repeating the article "a", which is a valid parallel structure. In the second sentence, the list "a painter, a sculptor, and a scientist" repeats the article "a" for each noun, also maintaining consistent grammatical form, making it a valid parallel structure too. Both follow the rule of uniform structure for coordinate items.

Answer:

1. Leonardo da Vinci, who was a painter, sculptor, and scientist, is perhaps best known for his painting the Mona Lisa.
2. Leonardo da Vinci, who was a painter, a sculptor, and a scientist, is perhaps best known for his painting the Mona Lisa.