In how many ways can 3 men and their wives be made stand in a line such that none of the 3 men stand in a position that is ahead of his wife?

• A. 6! /(3!*3!*3!)
• B. 6! /(2! *2!)
• C. 6! /(2! *2! *2!)
• D. 6! /(2! *3!)