Answer:
Every time they are dirty.
Explanation:
If you don't change the towels out for the sandwich station every time they get dirty, it can lead to some food born illnesses that you can potentially give customers. If a customer gets a FBI, you can lose a customer, or get sued. It is always best to change them every time they are visibly dirty to prevent accidents like FBIs from happening.
I would say A because the first sentence is comparing the two sports while the second sentence is contrasting the two sports. Hope this helps!
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