Your answer will be A Tomoko's interest in horticulture stemmed from: her father's love of plants, her mother's floral paintings, and her life on the tree farm. That's because in this sentence it is talking about her father, and her mother love for things also its not D because where the comma says it should be there should be a period its not B where the comma said it should be there's just should be no comma at all its not C because C has a topic sentence for a story also where the comma should be there should be no comma.
Your answer is A.