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Which pattern fits in the place of the question mark?

B
C
A
D

The Fact

There are over seven thousand brains in a Brain Bank at Harvard which they use for research. And no, it has not been used as a setting in a horror movie!

What's the difference between a deposit and a bank credit? For example, deposit - it is when you have a money, but you are living as you don't have it. A credit - it's when you don't have a money, but you are living as you have it.