the last multiple choice today

[meomuopcon]

These two pens are________. They look exactly alike

a. identical
b. indifferent
c. same
d. like

Pls explain which one is the best answer.

I think "d" but i don't know how to explain. in what case we use a/b/c?

Pls reply me soon.

Looking forward to your explanation

Thank you

Kitten

[Casiopea]

a. identical means, the same.
b. indifferent means, don't agree. (People are indifferent)
c. same requires a determiner, the.
d. like is not possible. 'alike' means, similar.

My choice, a. 'identical'

All the best.