If P, Y and Z are weights of cement, fine aggregates and coarse aggregates respectively and W/C is the water cement ratio, the minimum quantity of water to be added to first batch is obtained by the equation

A

$$0.1 P + 0.3 Y + 0.1 Z = \frac{W}{C} \times P$$

B

$$0.3 P + 0.1 Y + 0.01 Z = \frac{W}{C} \times P$$

C

$$0.4 P + 0.2 Y + 0.01 Z = \frac{W}{C} \times P$$

D

$$0.5 P + 0.3 Y + 0.01 Z = \frac{W}{C} \times P$$