If two cuboids of dimensions 3 cm × 3 cm × 6 cm are placed height by height, what would be the dimensions of the resulting figure be?

Question

( A ) l = 6 cm, b = 3 cm ,h = 6 cm
( B ) l = 5 cm, b = 4 cm ,h = 6 cm
( C ) l = 3 cm, b = 6 cm ,h = 6 cm
( D ) l = 6 cm, b = 4 cm ,h = 6 cm