21. The main purpose of the passage is to:
Your Answer is
Correct Answer is C
Explanation
The first paragraph describes the 17th century Dutch painter Saenredam, the second to fourth paragraphs are the painter's life, and the latter paragraphs are the painter's works.
Ab item: Inconsistent with the topic of the article, excluded.
Item D: The focus is not on the three painters, but on Saenredam.