Use of "slip"

[Ofelia]

English Synonym, Elementary Level

ESL/EFL Test #72 "Synonyms for mistake and error", question 7

Whose ......... is this? Yours, I'm afraid.

(a) blunder
(b) slip
(c) fault
(d) error

English Synonym, Elementary Level

ESL/EFL Test #72 "Synonyms for mistake and error", answer 7

Whose fault is this? Yours, I'm afraid.

Correct answer: (c) fault

Your answer was: incorrect
Whose slip is this? Yours, I'm afraid.
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hello, I would like to know what is the correct use of "slip".

thank you
ofelia

[Conchita]

A slip is, among other definitions, a (usually slight) mistake or error, caused by carelessness:

I made a slip when I was writing the cheque.

A slip of the pen/tongue is a small mistake in writing/speaking.

[Vladimir13]

Hi Teachers,

Oh! I've just noticed that the text in the test and in its answer differs. So, if the test example is "Whose fault is it that the pizza delivery's late? Yours, I'm afraid." then why "blunder" is not correct here? ? Or it would be correct?

Thank you,
Vladimir.
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My little horse must think it queer...