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What is the best way to combine sentence 1 and 2?
1- We were late to school this morning.
2- I forgot my backpack.
A. We were late to school this morning so I forgot my backpack.
B. I forgot my backpack we were late to school this morning.
C. I forgot my backpack, but we were late to school this morning.
D. We were late to school this morning, and I forgot my backpack.
D. We were late to school this morning, and I forgot my backpack.