Usage of "by or on credit card"?

[Qumar]

Business Idiom in English, Intermediate level

ESL/EFL Test #422 "Retail Sales Phrases", question 9

Would you like to pay cash or ......... credit card?

(a) by
(b) on
(c) to
(d) for

Business Idiom in English, Intermediate level

ESL/EFL Test #422 "Retail Sales Phrases", answer 9

Would you like to pay cash or by credit card?

Correct answer: (a) by
_________________________

let me know we use " by or on credit card"?

Qumar

[Esl_Expert]

Hello Qumar,

The word "by" is the correct answer in this test.

The preposition "on" is not idiomatic in the test sentence, but you could possibly use "on" in combination with "credit card" this way, for example:

Cashier: How will you be paying for that?
Customer: I'd like to put it on my credit card.

You can also say "on credit":
http://dictionary.cambridge.org/define.asp?key=18165&dict=CALD
However, if you buy something on credit, that does not necessarily mean that you use a credit card.

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