Answer:
Demand in January will be 640 units
So option (C) will be the correct option
Step-by-step explanation:
We have given average demand for a particular product is 800 units
And seasonal index = 0.8
We have to find the demand in a particular session , that is in January
We know that seasonal index is given by

So

So demand in January = 640
So option (c) will be the correct option