In the given diagram, we can see that there are three concentric circles. Concentric circles are circles that share the same center point but have different radii. Now, if we add a fourth circle inside the innermost circle, we need to determine the number that will be inscribed in that circle.

To solve this, let`s analyze the pattern. The numbers in the concentric circles follow a decreasing order as we move from the outer circle to the inner circles. In this case, the numbers are 8, 7, 3. So based on this pattern, the number to be inscribed in the fourth innermost circle will continue the decreasing pattern and be less than 3.

Looking at the options provided, we can see that option 2, which is 7, fits this pattern. Therefore, the correct answer is option 2.