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At the parking structure Viv got a lot of the new dollar coins after paying for parking . They 're very shiny ! We kept M company while she paid and then we off to the vehicles . I was riding with Viv and we were going to pick up Joe at Vienna Metro .

What may be the reason for her getting dollar coins back ?
Choose from:
(a). Because she over paid in cash .;
(b). Because she was able to get cashback from her account .;
(c). Because she specifically asked for them .;
(d). Because she paid with her credit card .;
(a).