As per IS 456 the cross-sectional area of longitudinal steel in a column should not be less than

0.8% of the area of the column

1.5% of the area of the column

2.5% of the area of the column

5% of the area of concrete

Longitudinal reinforcement = C/S area of longitudinal reinforcement.
It shall not be less than 0.8% and not more than 6% of the gross c/s area of the column.
Hence option A is the correct answer.

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