Select a suitable figure from the four alternatives that would complete the figure matrix. 

Step 1: Observe the matrix row-wise.
Step 2: In each row: • The first figure contains a basic shape.
• The second figure is the same shape with added diagonal/curved extensions.
• The third figure adds four small circles symmetrically to the second figure.
Step 3: In the third row, the middle figure already has the required extensions, so the missing figure must be that shape with four circles added. Step 4: Among the options, figure (b) exactly matches this requirement.