“Hi! I just wanted to let you know that I am grateful for having you as a mentor and teacher. You have helped me to learn more about [insert examples here] and I am so thankful for that. Thank you for all that you do, it really helps shape the future generation.
Happy teacher appreciation week!
From,
[Your name]
<span>A. them; indirect object because "them" would be benefiting from the parents helping. making them the indirect object.</span>