Select the option that is related to the third number in the same way as the second number is related to the first number.56 : 30 :: 78 : ?

Select the option that is related to the third number in the same way

1.	Select the option that is related to the third number in the same way as the second number is related to the first number.56 : 30 :: 78 : ?
A.	61
B.	56
C.	50
D.	53
Answer» C. 50