Task: Question Answering
Input (English): Question: 150 ml of 30% sulphuric acid was added to approximate 400 ml of 12% sulphuric acid solution. Find the approximate concentration C of the acid in the mixture?

 Option A: 1/2

 Option B: 1/3

 Option C: 1/4

 Option D: 1/6

 Option E: 1/5
Output (English): Option D