Answer:
D. rise by $1 million
Explanation:
For Fed if it purchases any security from any other bank then the balance of deposits will increase accordingly with such value in Fed.
As Fed is a central bank, it will be termed as reserves in the books of bank accordingly its reserves will increase as Fed has made investment in it.
Although, the deposits of Fed will also increase as because by purchasing the securities its cash in hand decreases and it tends to increase the deposits, by the same.
Therefore the deposits will increase by $1 million only.