Mashaal Masha
Over twenty years ago, in a landmark experiment in the psychology of choice, professor Sheena lyengar set up a jam-tasting booth at a grocery store. The number of jams available for tasting ________ some shoppers had twenty-four different options, others only six. Interestingly, the shoppers with fewer jams to choose from purchased more jam.

Which choice completes the text so that it conforms to the conventions of Standard English?
Difficulty: Hard
A: 

varied:

B: 

varied,

C: 

varied, while

D: 

varied while

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