Direction: Improve the bracketed part of the sentence.
(Meditation have been) the most effective way of boosting concentration level.

Options

A. a) Meditation was
B. b) Meditation has been
C. c) Meditation will be
D. d) No Improvement

Answer

B

Explanation

Meditation is a Singular Subject. Hence, Singular Verb i.e. Meditation has been is the right usage.