Answer:
Option C
Explanation:
In simple words, single sourcing refers to the method under which an organisation places orders for its raw material from a single supplier. This practice is implemented due to the advantages such as discounts that one might get from purchasing from a single entity and also the schedule for deliverers can be scheduled as per one own needs.
However such method is useful only for small orders and it burdens on the flexibility which makes the entity awfully dependent on supplier.