Correct option is B
When concrete is to be transported by pumping, the slump should be
between 5 to 7.5 cm. This range ensures that the concrete is workable enough to flow through the pump and the pipes without segregation or blocking.
More than 1 cm: Too general and not specific to pumping requirements.
Between 5 to 7.5 cm: Correct, as this range is optimal for pumpability.
More than 2.5 cm: Not specific enough for pumpability.
Between 2.5 to 5 cm: May be on the lower end for effective pumping.
Therefore, the correct answer is (b) Between 5 to 7.5 cm.
