Select the most appropriate word to fill in the blank.
Scientists at Cambridge University are _______ how plants can give us sustainable energy.

Options

A. looking
B. investigating
C. scrutinizing
D. inspecting

Explanation

scrutinizing- जांचना - examine or inspect closely and thoroughly.
(b) investigating- छानबीन
(a) looking-direct one.s gaze in a specified direction.
(d) inspecting -निरीक्षण करना- examine (someone or something) to ensure that they reach an official standard