The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than A. 0.15 B. 0.12 C. 0.30 D. 1.00

The correct answer is A. 0.15.

The percentage of reinforcement in case of slabs, when high strength deformed bars are used is not less than 0.15. This is to ensure that the slab has adequate strength to carry the loads imposed on it.

Option B, 0.12, is too low and may not provide the required strength. Option C, 0.30, is too high and may not be necessary. Option D, 1.00, is not a valid option.