A = Area of the largest circle drawn inside a square of side 1 cm.
B = Sum of areas of 4 identical (largest possible) circles drawn inside a square of side 1 cm.
C = Sum of areas of 9 identical circle (largest possible) drawn inside a square of side 1 cm.
D = Sum of area of 16 identical circles (largest possible) drawn inside a square of side 1 cm.

Which of the following is TRUE about A, B, C and D?