All regular polygon:

A. Have four sides

B. Have an even number of sides

C. are symmetrical

D. are the same size

C. Are simmetrical

Explanation

A. is false because only quadrilaterals have 4 sides

B. is false because polygons like equilateral triangle and regular pentagon have an odd number of sides

D. A polygon doesn't have an unique size. It changes every time, cause we can decide its size