The main clause is clams and the subordinate clause is fresh used as an adjective.
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:
It tells me that tom is not happy with you because you ask too many questions
Explanation: