Since this drawing is his way of reminding her that she and their garden are "as safe as a missel thrush", it makes her one of the many creatures whose secrets he keeps faithfully. So, having that in mind, I would say the correct answer is A) his trustworthiness.
I believe it’s B. because his father told him not to go onto the ice and George knew what he was doing would probably have a consequence behind it so hesitates contemplating whether or not should he listen to his father or go on the ice and show his friends he’s not scared or whatever. :>
Atticus Finch believes that Mrs. Dubose is the bravest person he knows.
It is important to stand up for others because it shows great initiative and personal kindness.