The correct answer is D. Mary Louise is characterized positively through Dorothy Knerr's words.
Step-by-step explanation:
In literature, characterization refers to the way the personality, appearance, and traits of characters are revealed. In the excerpt presented the character Mary Louise is revealed through the words of other girls. In this way, Sue Finley and Dorothy Knerr characterize positively Mary Louise because they both believe they should ask her about the issue they are discussing and therefore they might consider her as smart, this is shown in Dorothy's words "Mary Louise has a way of untangling things, you know". This implies the correct statement about characterization is D.