Glaucon suggested that… a. It is better to perform injustice but worse to have done it to us.
b. All people desire to treat each other with justice.
c. The world is dog-eat-dog.
d. Law is only necessary for the unjust.
e. Injustice is so much better than justice that only a fool would choose to be just.

E).  Injustice is so much better than justice that only a fool would choose to be just.

Explanation:

The key idea that Galucon emphasizes is that 'justice itself is not a good idea' and calls it 'self-interested.' He finds the very human nature to be unjust and self-seeking. The humans perpetuates justice only for their consequential good. He rather suggests that perfect unjustness is more pleasant, rational, and better than justice and argues that no individual pursues justice willingly. The argument he puts on is that 'if people are given an opportunity to be unjust without any ache, they would propagate it rationally.' Thus, option E is the correct answer.

it should be d or b but i'm sure it's d