Germany mainly did what in the battle of London? A. It was an air bombing campaign
B. Attack with their navy
C. It was a land invasion
D. Used Blitzkrieg

A. It was an air bombing campaign.

Explanation:

The Battle of London was really a series of campaigns, which extended from the usage of large scale bombing operations on British fortifications and towns, that slowly transitioned with the duration of the war to the use of V1 and V2 rockets.

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john maynard keynes developed new economic theories in response to the stock market crash of 1929. great depression of the 1930s. first and second world wars. economic boom of the 1950s.

c or d both can be the answer