Which revision uses a transition most effectively to clearly combine these sentences?
All day long Kadeem's stomach growled. He was hungry.
A. All day long Kadeem's stomach growled before he was hungry.
B. All day long Kadeem's stomach growled because he was hungry.
C. All day long Kadeem's stomach growled until he was hungry.
D. All day long Kadeem's stomach growled, but he was hungry.