A. 6

B. 9

**C. 24**

D. 30

Volume of block = (6 X 9 X 12) cm^{3} = 648 cm^{3}.

Side of largest cube = H.C.F. of 6 cm, 9 cm, 12 cm = 3 cm.

Volume of this cube = (3 X 3 X 3) = 27 cm^{3}.

Number of cubes = 648/27 = 24.

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