Answer:
A) Backward vertical integration.
Explanation:
In this new rapid changing environment where competitiveness is a key to success, often businesses try hard to keep the cost low, without loosing it's charms. Sometimes, it does that by doing the processes of supply chain itself that is vertical integration.
Backward Vertical Integration: It is a type of integration in which company takes the responsibility of creating the required product which is prerequisite for the final product.