The part of this excerpt from Jhumpa Lahiri' that indicates Hema's mother's Bengali heritage is option D.
The heritage was to ensure that children didn't sleep alone. It was the practice for them to ensure that every child slept with an adult.
Hence, the best option is D:
"My mother considered the idea of a child sleeping alone a cruel American practice, and therefore did not encourage it, even when we had the space.
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