In the following question there is a set of four figures labeled 1, 2, 3, and 4 called the problem set followed by set of four other figures labeled a, b, c and d called the answer set. Figure 3 contains a Question Mark (?). Select suitable figure from the answer set which will substitute the question mark (?) so that a series is formed by the figures 1, 2, 3, and 4 taken in order. The label of the selected figure is the answer.