Select the figure from among the given options that can replace the question mark (?) in the following series.

Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. 
In first step, one
is added. In the next step 3
are added. In the next step 5
are added. So, in the next step 7
will be added and the pattern will be:
Hence, option 4 is the correct option.