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To calculate the cost for a 12-ounce cup of lemonade using the pricing plan expression, substitute m = 12 into the expression:
$0.45 + $0.3(12) = $0.45 + $3.60 = $4.05
Therefore, the restaurant will charge $4.05 for a 12-ounce cup of lemonade.
So the answer is B. $4.05.