What does "black mark" mean?

[Ajjab]

Test No. incompl/inter-2 "Like a red rag", question 6

She lost the company a lot of money last week and as a result has got a ......... mark against her name.

(a) red
(b) blue
(c) white
(d) black

Test No. incompl/inter-2 "Like a red rag", answer 6

She lost the company a lot of money last week and as a result has got a black mark against her name.

Correct answer: (d) black

Your answer was: incorrect
She lost the company a lot of money last week and as a result has got a red mark against her name.
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why choose this color?

Ajjab

[Alan]

This colour suggests that it is a bad mark.
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English as a Second Language
You can read my ESL story A New Season

[mudium]

but i think even red showes the same meaning right? then why cant we use red hear
jyo