range over or vary over?

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san2612

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1. Our biological clocks govern almost every aspect of our lives. Our sensitivity to stimuli _______ over the course of the day, and our ability to perform certain functions is subject to fluctuations. Consequently, there is a peak time for tasks such as making decisions: around the middle of the day.



A. modifies
 
B. ranges
 
C. varies
 
D. waves


I chose B but the answer is C. Do you think "range over" sounds better?
 

SoothingDave

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No. It varies.
 

emsr2d2

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It definitely varies. Remember that this is not a phrasal verb you're looking for. The verb is simply "to vary" followed by a time period "over the course of a day". It's not "to range over".
 
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