The part of the sentence that talks about something a reader might know is D. Cooking is usually done in a kitchen.
The sentence talks about how Giovanni's father had cooked some soup in the kitchen.
The knowledge here that a reader would most likely already know is the place where the soup was cooked because food is usually cooked in the kitchen.
Find out more on the use of prior knowledge at https://brainly.com/question/24703657.
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