Digital PSAT Reading and Writing Practice Question 230: Answer and Explanation

Question: 230

More than 300 years ago, the idea was quite ________________ gravitational force toward one another with a force proportional to the product of the two masses and inversely proportional to the square of the distance between them.

Which choice completes the text so that it conforms to the conventions of Standard English?

  • A. revolutionary: two objects, regardless of their mass, exert
  • B. revolutionary, two objects regardless of their mass, exert
  • C. revolutionary-two objects regardless of their mass, exert
  • D. revolutionary; two objects, regardless of their mass exert

Correct Answer: A

Explanation:

(A) The colon sets off the clarification that follows, and the commas set aside the nonessential yet descriptive phrase, regardless of their mass. Choice (B) causes a run-on sentence. Choices (C) and (D) are both missing needed pauses.

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