Answer: Option 'C' is correct.
Explanation:
Since we have given that
Jane mixes 3 pints of blue paint with 4 pints of red paint to get her desired color.
So, the ratio will be

We have 16 pints of red paint and we have to find the pints of blue paint 'say x'.
According to question,
Since there is "direct variation" . So,our equation becomes,

Hence, Option 'C' is correct.