PSAT Writing and Language Question 312: Answer and Explanation

Question: 312

• A. NO CHANGE
• B. were providing
• C. provide
• D. providing

Correct Answer: A

Explanation:

Difficulty: Medium

Category: Agreement: Verbs

Getting to the Answer: Determine the subject of the underlined verb so you can ensure the subject and verb are in agreement. Although there are many words in between, the subject of the verb is "discovery"; all the words in between are prepositional or descriptive phrases that describe the discovery or its location. Since "discovery" is singular, the singular "provides," (A), is correct. (B) and (C) are incorrect because they are plural verbs. (D) is incorrect because it would result in a sentence fragment.