2

Set 5: Boundaries (Advanced)

Explanation

Answer: C

PASSAGE

The researcher hypothesized that exposure to nature _______ cognitive function and emotional well-being.

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

A. are improving
B. improve
C. improves✓ Correct
D. have improved

Detailed Answer Explanation

This question tests your understanding of sentence boundaries and punctuation. 'Exposure' is singular. Use singular 'improves.' To determine the correct answer, examine where complete thoughts begin and end. Look for independent clauses that need proper separation. A period, semicolon, or appropriate conjunction can correctly join or separate these ideas. When analyzing sentence boundaries, pay attention to how ideas flow from one sentence to the next. Correct punctuation ensures clarity and prevents confusion for readers. Review the options carefully to identify which choice creates proper sentence structure.

Key Evidence:

• "exposure (singular)"

Why others are wrong: A ('Are improving' is plural.), B ('Improve' is plural/base form; 'exposure' needs singular verb.), D ('Have improved' is plural.).