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Option 1 : 1
The error lies in part 1 of the sentence as the past tense of the verb 'saw' is incorrect and must be replaced with the past participle form 'seen' to make the sentence correct. Present perfect tense is used to refer to an activity which got completed recently. Option 1 is thus the correct answer.
It should read as:
'The 21st century has seen a series of central government..'
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