PSAT Writing and Language Question 574: Answer and Explanation

Question: 574

• A. NO CHANGE
• B. with
• C. at
• D. on

Correct Answer: C

Explanation:

(C) Certain expressions are used frequently in the English language, and it is important to use the common preposition when using these expressions. The phrase "at the core" is an example of one of those expressions. Using "at" is far preferable to the other choices if only because that is the way this expression is typically written.