The triangular region shows the number of possible ounces of platinum, x, and the number of possible ounces of silver, y, a jewelry maker can mix together to make a certain piece of jewelry. which combination of platinum and silver can the jewelry maker use?

Below are the choices that can be found elsewhere:

A.12 oz of gold and 20 oz of silver

B.10 oz of gold and 10 oz of silver

C.16 oz of gold and 30 oz of silver

D.25 oz of gold and 20 oz of silver

The answer is A because the points(12,20) are in the blue shaded area.
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The first one is correct