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To determine how much expectorant is in a quart when each tablespoon contains 25 mg, it's essential to know the number of tablespoons in a quart.

There are 64 tablespoons in a quart, since one quart equals 32 ounces and there are 2 tablespoons in one ounce (32 ounces x 2 tablespoons/ounce = 64 tablespoons).

Next, to find the total amount of expectorant in a quart, multiply the amount of expectorant per tablespoon by the number of tablespoons in a quart:

25 mg/tablespoon × 64 tablespoons = 1600 mg.

Thus, the total amount of expectorant in a quart is 1600 mg, making this the correct answer.