Which of the following are in descending order of their value ?%!

• A. 1/3 , 2/5 , 3/7 , 4/5 , 5/6 , 6/7
• B. 1/3 , 2/5 , 3/5 , 4/7 , 5/6 , 6/7
• C. 1/3 , 2/5 , 3/5 , 4/6 , 5/7 , 6/7
• D. 6/7 , 5/6 , 4/5 , 3/7 , 2/5 , 1/3