General Studies · Number Analogy

Two sets of numbers are given below. In each set, performing a specific sequence of mathematical operations on the first number yields the second, which in turn yields the third, and so on. Which of the options follows the exact same operational pattern? (Note: Operations must be performed on the numbers as whole numbers, without breaking them into constituent digits. For example, operations must be performed on 13; breaking 13 into 1 and 3 and then performing operations is not allowed.)3 - 9 - 12 - 24 ; 4 - 16 - 20 - 40