It's C because the sentence refers to a thing not multiple people and it has to say its not it's because it's mean it is so its is posesive and it's is not. It wouldn't make any sense to say the government's failing it is pledges.
The correct sentence is: The government's failing to keep its pledges will mean disaster. This is the option that correctly shows possession (the government's) and uses the possessive adjective 'its' without an apostrophe, which is appropriate for the possessive form referring to the government.
The other options contain mistakes either in possession or in the use of 'its' and 'it's'. Remember that 'it's' is a contraction for 'it is' or 'it has', while 'its' is a possessive adjective. Since we want to show possession and not use a contraction, 'its' is the right choice.
The correct sentence is (C) 'The government's failing to keep its pledges will mean disaster.' This option properly uses possessive forms and avoids errors associated with contractions. Understanding the difference between 'its' and 'it's' is key to writing correctly in English.
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