Question:

The following sentence has been split into four segments. Identify the segment that contains a grammatical error.
Several studies support the idea / that the amount of consistent sleep / you receive significantly impacts / a quantity of gray matter in your brain.

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Pay close attention to articles ('a', 'an', 'the'). Their correct usage depends on whether you are referring to a specific (definite) or non-specific (indefinite) noun. In scientific contexts, precision is key, and 'the' is often required.
Updated On: Feb 14, 2026
  • Several studies support the idea
  • that the amount of consistent sleep
  • you receive significantly impacts
  • a quantity of gray matter in your brain
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The Correct Option is D

Solution and Explanation

Step 1: Understanding the Question:
The task is to find the segment of the sentence that contains a grammatical error.
Step 2: Detailed Explanation:
Let's analyze each segment of the sentence: "Several studies support the idea that the amount of consistent sleep you receive significantly impacts a quantity of gray matter in your brain."


Segment (A) "Several studies support the idea": This part is grammatically correct. The plural subject 'studies' matches the plural verb 'support'.
Segment (B) "that the amount of consistent sleep": This part is also correct. 'Amount' is correctly used for the uncountable noun 'sleep'.
Segment (C) "you receive significantly impacts": This part contains the main verb 'impacts'. The subject of this verb is "the amount of consistent sleep you receive". The singular subject 'amount' correctly matches the singular verb 'impacts'. This is grammatically correct.
Segment (D) "a quantity of gray matter in your brain": The error lies in the use of the indefinite article 'a'. The verb 'impacts' suggests an effect on a specific thing. The sentence implies that sleep impacts the overall quantity of gray matter, not just any random quantity. Therefore, the definite article 'the' would be more appropriate: "impacts the quantity of gray matter...". Using 'a' makes the statement vague and is contextually incorrect.
Step 3: Final Answer:
The grammatical error is in the segment "a quantity of gray matter in your brain" due to the incorrect use of the article 'a'.
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