They didn’t thank us for the meal before they left. I thought this was very rude of them.

A. They didn’t thank us for the meal before they left, which I thought was very rude of them.

B. They didn’t thank us for the meal before they left, that I thought was very rude of them.

C. They didn’t thank us for the meal before they left which I thought was very rude of them.

D. They didn’t thank us for the meal, which I thought was very rude, before they left, of them.

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