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The pricing plan is $0.45 for the cup plus $0.30 per ounce of lemonade.
So for a 12-ounce cup of lemonade, the calculation would be:
$0.45 (for the cup) + $0.30 x 12 (for 12 ounces of lemonade) = $0.45 + $3.60 = $4.05
Therefore, the restaurant will charge $4.05 for a 12-ounce cup of lemonade.
The answer is B. $4.05