Step 1: Analyzing the Extruded Shapes.
The extruded form of A is a simple rectangle, which has 6 surfaces. B, which is an extruded form of A, has a rectangular prism shape with 6 surfaces.
Step 2: Understanding the Form of C.
C is a shape with a complex structure (a snowflake-like figure). When extruded, each branch of the figure will add more surfaces. The extruded form of C will have 8 surfaces in total.
Step 3: Conclusion.
Thus, the extruded form of C will have 8 surfaces. Therefore, the correct answer is (3) 8.