To find Sarah's sale price after applying the 25% off coupon, you first need to calculate the amount of the discount and then subtract that from the regular price.
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Calculate the discount: \[ \text{Discount} = \text{Regular Price} \times \text{Discount Rate} = 60 \times 0.25 = 15 \]
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Subtract the discount from the regular price: \[ \text{Sale Price} = \text{Regular Price} - \text{Discount} = 60 - 15 = 45 \]
So, Sarah's sale price is $45.
The correct answer is D. $45.