Critical Reasoning (CR) | Re: Advertisement: Every time you use your X card to charge any purchase

Hi bro, I went with D too at first time, but after I read it again, I found a problem with D.
The passage says the credit will be used as a deduction of the cost of your ticket. Eg: the original ticket price was 1000 and you can’t afford it, but you got some credits (such as 250), then the new price of the ticket will become 750 and now you can afford it.
But D says accumulate
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