Which of the following statements are true about quicksand?i. It is only a condition but not a type of sand.ii. It is a condition and a type of sand too.iii. Quicksand condition reaches when critical hydraulic gradient is approximately equal to unity.iv. Quicksand condition occurs more commonly in coarse grained sand or gravels than fine sand.

• A. Both statements ii and iii are true
• B. Statements ii, iii and iv are true
• C. Both statements i and iii are true
• D. Statements i, iii and iv are true