Answer :
The author most likely thinks that the company has exaggerated its two-day shipping promise (B).
Satire means that the author uses wit, sarcasm, or inony (in this case, through a narrative of events) to discredit a person or an idea.
Here, the author is adding to their story several circumstances which show how they do not believe in strict two-day shipping:
- the customer, we are told, has allergies, which means that he was relying on the air purifier to arrive within two days to help with his health and not simply because he is impatient;
- wouldn't you know, the order was placed precisely before the company's days off for shipping, and apparently the customer was not aware of these conditions.
These elements, one could argue, create a sort of worst-case scenario, which enables to author to disparage the company's two-day shipping promise.