In this Q, there is a certain relationship between two given words \ numbers on one side of ( : : ) and one word \ number is given on another side of ( : : ) while another word \ number is to be found from the given alternatives, having the same relation with this word \ number as the words \ numbers of the given pair bear. Choose the correct alternative.56 : 7 :: 72 : ?

• A. 6
• B. 7
• C. 8
• D. 5