Correct Option: D

Workability is one of the physical parameters of concrete which affects the strength and durability as well as t he cost of labor and appearance of the finished product.
Factors which affect workability of concrete are:
1. Cement content of concrete
2. Water content of concrete
3. Mix proportions of concrete
4. Size of aggregates
5. Shape of aggregates
6. Grading of aggregates
7. Surface texture of aggregates
8. Use of admixtures in concrete
9. Use of supplementary cementitious materials