Select the option that is related to the fourth number in the same way as the first number is related to the second number and the fifth number is related to the sixth number.

15 : 105 :: ? : 196 :: 4 : 28

28

Pattern followed is :

1st number × 7 = 2nd number

15 : 105

15 × 7 = 105

4 : 28

4 × 7 = 28

Similarly ,

? : 196

x × 7 = 196

x = 28 , is correct answer .