Answer
B. Processing receipts at the end of each day can be time-consuming.
Step-by-step explanation
Lets use logical.
Firstly, A, it doesn't make sense (Customers rarely expect businesses to accept credit cards as payment.), pure nonsense in 2022.
Next, B, this seems much more probable, but lets continue.
Now, C, this isn't entirely true, you don't need a device to swipe the card, payments can be charged in various other ways.
Finally, D, while I do see how someone could think this is a valid answer, you are NOT putting the in person employers at risk and even if you were, you have the customers information.