Question

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Explanation:

The addition property of equality states that if we add the same quantity to both sides of an equation, the equation remains true. In Molly's rewrite, she added \( 3d \) to both sides of the equation \( -5d + 11 = 8 - 3d \) to get \( -5d + 11 + 3d = 8 - 3d + 3d \). The distributive property involves distributing a factor over a sum/difference, the multiplication property of equality involves multiplying both sides by a quantity, and the substitution property involves replacing a quantity with an equivalent one—none of these match. Only the addition property of equality applies here.

Answer:

A. addition property of equality