Usage of idiom: Everyone is very competitive with one another

[Rebecca]

English Language Tests, Intermediate level

ESL/EFL Test #268 "Eating Idioms", question 9

It's a dog eat dog environment -- means: It's an environment where ..........

(a) animals run wild
(b) everybody is very rude to one another
(c) everybody is very cruel to one another
(d) everyone is very competitive with one another

English Language Tests, Intermediate level

ESL/EFL Test #268 "Eating Idioms", answer 9

It's a dog eat dog environment -- means: It's an environment where everyone is very competitive with one another.

Correct answer: (d) everyone is very competitive with one another
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This idiom is similar to one in Chinese. But it's this a chiglish ( Chinese- English)? When I was choosing the answer, I stopped by (c) and (d), they are similar.

In what condition we can use it?

Rebecca

[Conchita]

A dog-eat-dog situation involves competitiveness, which, unfortunately, often brings out the worst in people, some of whom will do anything to reach their goals. So, yes, rudeness and cruelty can be part of it.

dog-eat-dog