Direction: In the given question a sentence is divided into five parts out of which the last part is correct. Out of the remaining four, there are errors in three parts. Choose the part that doesn't have an error. If all the four parts are correct, mark option 5 i.e. All are correct as the answer.

If therefore, a logic fails to employ (A) the pragmatic test, it is doom to (B) remain purely formal, and the possibility at (C) applying it's doctrines to actual knowledge (D) and their real validity, remain in doubt.