The answer is option c. Lizzie has to buy more pizza and less soda so that she can maximize her utility.
The reason why this is the answer is because, the utility that she gets from the consumption of pizza is greater than the utility that she derives from consuming soda.
From the question, when she eats pizza she gets 300 units of utility compared to when she drinks her last soda that only gives her 100 units of utility.
In conclusion, She should buy more of what gives her maximum utility. That is Pizza.
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