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.
Answer:
No person, powerful or weak, rich or poor, can escape the laws of God.
Explanation:
Apex
number 1D.2A.3B.4A.5D.6C.7D.8A.9B.10B.11C.12D