Explanation:

- In the sentence, the group of words "artists who make sculptures" needs an equivalent single term.

- Option 1: Painter — Refers to artists who paint, not the same as making sculptures.

- Option 2: Artisan — Generally refers to a skilled craftsperson but not specific to making sculptures.

- Option 3: Sculptor — Specifically refers to an artist who creates sculptures, matching the description perfectly.

- Option 4: Potter — Refers to someone who makes pots and other ceramic items, different from a sculptor.