Answer: b. Demeaning
Step-by-step explanation:
Demeaning someone means to speak to someone in a very disrespectful manner by insulting them with the aim being to degrade them and make them feel less dignified. It can also be done through actions.
Arachne here called the person a silly fool who is worn out and witless (stu-pid) which served to insult the person and therefore demean them. The tone is therefore demeaning.