Final answer:
The correct ratio of pasta to cheese is 4:1.
Step-by-step explanation:
To find the ratio of pasta to cheese, we need to invert the given ratio of cheese to pasta. The given ratio is 1 1/2 cups of cheese to 6 ounces of pasta.
Now, let's invert the ratio: 1 1/2 cups of cheese to 6 ounces of pasta becomes 6 ounces of pasta to 1 1/2 cups of cheese.
To simplify the ratio, we can convert 1 1/2 cups to 3/2 cups.
Therefore, the correct ratio of pasta to cheese is 4:1, option C.