Clear my choice To==> 1 2 3 Supply |_3 From 16 30 20 50 4 | 4 3 B 40 40 | 5 |_6 10 15 25 Demand 20 80 15 If cell C1 should be selected to be filled in the next solution. How many units would be assigned to this cell? Select one: a. 10 b.20 O c. 15 d.-15 e. 30