In this question, there is a certain relationship between two given numbers on one side of (∶ ∶) and one number is given on another side of (∶ ∶) while another number is to be found from the given alternatives, having the same relation with this number as the numbers of the given pair bear. Choose the correct alternative2 ∶ 16 ∶∶ ? ∶ 81

• A. 1
• B. 27
• C. 3
• D. 9