Task: Question Answering
Input (English): Question: In a stockpile of products produced by three machines M1, M2 and M3, 40% and 30% were manufactured by M1 and M2 respectively. 3% of the products of M1 are defective, 1% of products of M2 defective, while 90% of the products of M3 III are not defective. What is the percentage of defective in the stockpile?

 Option A: 3%

 Option B: 5%

 Option C: 4.5%

 Option D: 4%

 Option E: 6%
Output (English): Option C