The germans changed their tactics in preparing for operation by beginning to bomb london and other cities.

The name of the operation here is the Sea Lion.

This code name was used for a Nazi Germany's plan which detailed the invasion of Britain during the Battle of Britain. Because getting troops on the British shore proved to hard and the air losses were mounting, Hitler postponed the operation indefinitely and in the end the War ended before he could put it to action.

Explanation:

A trade-off is isolating what that forgone alternative is, and opportunity cost involves calculating the cost of the trade-off. Trade-off and opportunity cost are therefore linked, with the former helping to calculate the latter.