Answer:
Greg sees his father in a new way after he speaks with Lemon Brown.
Step-by-step explanation:
This statement shows that Greg has a notion about his father that changes when he speaks with Lemon Brown. He drops the old perspective of his father that he has on his head and picks up a new one.
Option A is incorrect because the statement does not mean that he "has different feelings about his father after speaking with Lemon Brown", rather, it means that he has a different feeling about him.
Options C and D are also incorrect because there is no sufficient evidence from the sentence that shows that Greg now appreciates his father more or knows all that his father is about.