Answer:
A firm's ownership of vertically related activities
Step-by-step explanation:
As we know that
There are two types of integration i.e horizontal and vertical
The horizontal integration is the integration in which two or more firms amalgamate dealing in the same type of business i.e their products and the level of production is same
While on the other hand the vertical integration is the integration in which the one firm acquired or purchased another firm dealing in different stages but the production level remains the same
Hence, the first option is correct