Çözüldü Sentence Completion - Subject and Verb Agreement - Grammar

As the American population grows, ages, and gains better access to affordable health insurance, the demand for primary medical services ______ expected to skyrocket.

A) are
B) is
C) has been
D) would be
E) could have been

Correct Choice: B (is)

Explanation in the Book: "The subject of this verb is demand, which is singular."

McGraw-Hill Education SAT, 2020 edition
https://en.ru1lib.org/book/5278167/a9ce00
Page 36 (63 in the pdf file), Question 1
Explanation on page 75 (102 in the pdf file)