Difference between credit and credulous

[Guest]

Test No. incompl/inter-11 "Accounts", question 3

To spread the cost of spending on articles you buy many big departments let you open a ..........

(a) credible
(b) credit
(c) credited
(d) credulous

Test No. incompl/inter-11 "Accounts", answer 3

To spread the cost of spending on articles you buy many big departments let you open a credit.

Correct answer: (b) credit

Your answer was: incorrect
To spread the cost of spending on articles you buy many big departments let you open a credulous.
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to spread the cost of spending on articles you buy many big departments let you open a

a) credit
b)credulous

[Alan]

Credit is the right answer. Credulous is an adjective and means believing everything you are told.
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English as a Second Language
You can read my ESL story Present Simple

[Kisaki]

Hi
I wanna wonder "Open a credit" means to open an account with the bank,is it right?