If the size of a column is reduced above the floor, the main bars of the columns, are A. Continued up B. Bent inward at the floor level C. Stopped just below the floor level and separate lap bars provided D. All the above

The correct answer is: C. Stopped just below the floor level and separate lap bars provided.

The main bars of the columns are stopped just below the floor level and separate lap bars are provided. This is done to ensure that the column is able to carry the load even though the size of the column is reduced above the floor. The lap bars are provided to transfer the load from the main bars to the smaller section of the column.

Option A is incorrect because the main bars of the columns are not continued up. Option B is incorrect because the main bars of the columns are not bent inward at the floor level. Option D is incorrect because only option C is correct.