Select the option that can be used as a one-word substitute for the given group of words.
One who cannot make a mistake

Correct option is A

The correct one-word for the given group of words is (a) Infallible.
· Infallible: Someone who is incapable of making mistakes or being wrong. (अचूक, जो गलती न करे)
· Example: The scientist believed his theory was infallible until new evidence proved otherwise.
Meanings of the given other options:
· Inimitable: Impossible to imitate or copy (अद्वितीय, अनुपम)
· Impregnable: Impossible to be defeated or broken into (अभेद्य)
· Inevitable: Certain to happen, unavoidable (अनिवार्य)