Select the most appropriate word to fill in the blank.
All his endeavors to win his teacher's favour proved ______ and did not bring the desired results.

Options

A. apparent
B. futile
C. perpetual
D. prosperous

Explanation

(b) futile-pointless
(a) apparent-clearly visible or understood, obvious.
(c) perpetual-never ending or changing.
(d) prosperous-successful in material terms, flourishing financially.