[ Grammar ]
Which is the correct way to write the following sentence?
I gave up on understanding calculus for it is impossibly difficult.
_
A. I gave up on understanding calculus, for it is impossibly difficult.
B. I gave up on understanding calculus, for, it is impossibly difficult.
C. I gave up on understanding calculus for it is impossibly difficult.
D. I gave up on understanding calculus. For it is impossibly difficult.

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