Quote:
Originally posted by Fljotsdale:
In that case, 'interactivity' is correct. There are times when you need the entire context before you can draw the right conclusions about anything. I answered this in bits before reading the whole thread. Sorry!
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I agree that "interactivity is correct." The text before the sentence in question sets up "Interactive shopping" as a key idea in the paragraph.
So I'm sorry to say that your teacher had the right answer, for the wrong reasons though. You can't eliminate response D simply by checking the subject-verb agreement. Instead, you need to look at the context of the sentence as it fits into the paragraph. The previous sentence explains that interactive shopping is going to have an effect. The next sentence then goes on to explain what that effect is.
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Most Subtle Official Straightman of the Laughing Hyenas -- Grammarian Brigade.
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