Option A: 3
         ○ The problem is a classic example of the *Four Color Theorem*, which states that any planar map can be colored with no more than four colors such that no two adjacent regions share the same color.
         ○ However, in this specific case, the figure can be colored using only three colors.
     ● Steps to determine the minimum number of colors:  
           ○ Identify regions that are adjacent (i.e., share a common boundary).
           ○ Assign the first color to one region.
           ○ Assign the second color to all regions adjacent to the first.
           ○ Use the third color for regions adjacent to those colored with the second color, ensuring no two adjacent regions share the same color.
     ● Conclusion: By following these steps, it is evident that only three colors are necessary to achieve the desired coloring, making Option A: 3 the correct choice.