Pick up the correct statement from the following

Detailed Explanation: Three Correct Statements on Concrete Mix

Why D (All options correct) is correct:
A — Correct: “Increase in water must be accompanied by increase in cement.” This is mix design principle. If you add water without extra cement, w/c rises and strength drops. To maintain target w/c and strength, cement must increase proportionally with any water increase. This is the basis of constant-w/c mix adjustments in IS 10262.
B — Correct: “Angular and rough aggregates reduce workability.” Angular, crushed aggregates have sharp edges and rough surfaces — both create high inter-particle friction and mechanical interlocking, requiring more effort (or more water) to achieve the same workability as rounded aggregates.
C — Correct: “Large aggregates increase workability due to less surface area.” Larger aggregate particles have a smaller total surface area per unit volume (or per unit mass). Less surface area = less water needed to wet all surfaces = more free water available for lubrication = higher workability for the same water content.

Verification of All Three Statements

Statement	True/False	Principle
A. More water needs more cement	True	Constant w/c = proportional cement increase
B. Angular aggregates reduce workability	True	High surface friction and interlocking
C. Larger aggregates increase workability	True	Lower surface area = less water demand

• All three are fundamental principles of concrete mix design and aggregate science.