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What is the correct way to combine the following sentences?
I want to eat lunch. I don't have lunch money.
A. I want to eat lunch, I don't have lunch money.
B. I want to eat lunch, but I don't have lunch money.
C. I want to eat lunch, so I don't have lunch money.
D. I want to eat lunch I don't have lunch money.
What is B. I want to eat lunch, but I don't have lunch money.