The reason clean energy is hard to come by is that we've spent the past 150 years depending on oil, and it's quite difficult to make the switch, Here "difficult to make the switch" is related to-
A. replacing analogue oil with digital fluid
B. manufacturing
C. inventing
D. controlling
E. making moves
সঠিক উত্তরঃ
E.
making moves
Explanation:

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