There are five statements present.One of them contains an error. Choose the incorrect sentence.
A. From the beginning of his reign, Putin has worked up to control Russia’s single most strategic asset: oil.
B. Ukraine had recently rebelled against Russia by rejecting a pro-Russian candidate in favor of pro-Western Viktor Yushchenko.
C. By seizing control over Russia’s vast oil and gas resources, Putin gained considerable global influence.
D. The gas cutoff also affected Europe,a timely reminder that Russia could make European states pay if they dared cross the Kremlin.
E. Barry Buzan asserted in 2004 that "China certainly presents the most promising all-round profile" of a potential superpower.
The error lies in sentence A as the preposition 'up' after the verb 'worked' is incorrect and should be eliminated. 'Worked up' means 'be extremely worried about something.' It should read as:'From the beginning of his reign, Putin has worked to control Russia’s single most strategic asset: oil.'
Option 1 is thus the correct answer.