Explanation
Correct answer: D.
Choice D is correct. The cost per gram of protein in large egg is $ divided by , which equals $. The cost per gram of protein in cup of milk is $ divided by , which equals $. It follows that the ratio of the cost per gram of protein in a large egg to the cost per gram of protein in a cup of milk is , which can be rewritten as .
Desmos solution:
Enter in Desmos:
Reviewed and rewritten by CookSAT
Why the other choices are wrong
Choice A
Choice A is incorrect and may result from finding the ratio of the cost per gram of protein in a cup of milk to the cost per gram of protein in a large egg (the reciprocal of the ratio specified in the question).
Choice B
Choice B is incorrect and may result from incorrectly calculating the unit rates or from errors made when simplifying the ratio.
Choice C
Choice C is incorrect and may result from incorrectly calculating the unit rates or from errors made when simplifying the ratio.