Lets look at each option:
A. Total sales of all refreshments at MoviemaniaтАЩs movie theaters increased by less than 5 percent last year.
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This argument is against Moviemania's claims. If every other refreshment increased by less than 5 percent, but popcorn increased by 5 percent, then there's no visible damage caused by the switch to different oil. Possible correct choice
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B. Moviemania makes more money on food and beverages sold at its theaters than it does on sales of movie tickets.
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This argument is not directly related to the increase / decrease in sales of popcorn due to oil. It talks about the side-effect of such increase / decrease instead. Wrong choice.
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C. MoviemaniaтАЩs customers prefer the taste of popcorn popped in coconut oil to that of popcorn popped in canola oil.
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This argument is not against Moviemania's claim. Wrong choice.
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D. Total attendance at MoviemaniaтАЩs movie theaters was more than 20 percent higher last year than the year before.
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This argument is not directly related to the increase / decrease in sales of popcorn due to oil (Unless people come to the theater to eat popcorn). Wrong choice.
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E. The year before last, Moviemania experienced a 10 percent increase in popcorn sales over the previous year.
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This argument is not against Moviemania's claim. Wrong choice.
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So, A is my answer