PSAT Writing and Language Question 503: Answer and Explanation

Question: 503

• A. NO CHANGE
• B. Unlike other systems of the body, the immune system is relatively invisible with soldiers housed throughout the body in the spleen lymph nodes, thymus, and bone marrow.
• C. Unlike, other systems of the body the immune system is, relatively, invisible with soldiers housed throughout the body in the spleen, lymph nodes, thymus, and bone marrow.
• D. Unlike other systems of the body, the immune system is relatively invisible, with soldiers housed throughout the body in the spleen, lymph nodes, thymus, and bone marrow.

Correct Answer: D

Explanation:

(D) In a complex sentence such as this, it's probably easier to eliminate the three incorrect choices rather than initially diagnosing the correct one immediately. Choice (A) features an unnecessary comma separating the subject from the predicate. Choice (B) neglects a comma between "spleen" and "lymph nodes," and choice (C) is incorrect from the very beginning with an unnecessary comma after "unlike." Upon eliminating those three, analyze the remaining choice, choice (D), and notice that it is faultless.