Since the height of each row is 3:
All 3 A regions have the same area (3x).
All 3 B regions have the same area (3y).
All 3 C regions have the same area (3*3 = 9).
Sum of the shaded regions = 2A + B + 2C.
Sum of the unshaded regions = A + 2B + C.
Since the sums are equal, we get:
2A + B + 2C = A + 2B + C
A + C = B.
Since A=3x, C=9, and B=3y, we get:
3x + 9 = 3y
x+3 = y.
x-y = -3.
Since the garden is square, each side = 9.
Thus, x+y=6, as shown in the figure above.
Adding the two equations, we get:
(x-y) + (x+y) = -3+6
2x = 3
x = 1.5.
The correct answer is
C.
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