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Of the billion or so Windows machines, some 63% still uses old XP version launched in 2001, in America, the proportion of XP users are over 80%.

A.	some 63% still use the old XP version launched in 2001, in America the proportion of XP users are	B.	some 63% still uses the old XP version launched in 2001 ; in America, the proportion of XP users are
C.	some 63% still use the old XP version launched in 2001 in America, the proportion of XP users is	D.	some 63% still use the old XP version launched in 2001; in America, the proportion of XP users is

Answer and Explanation

Answer:some 63% still use the old XP version launched in 2001; in America, the proportion of XP users is

Explanation:
Portions (per cent, fractions etc..) the verb will agree with the noun what follows the of (50 of the people come from ....,. 50% of the money comes from etc) In this sentence the n noun is machines; hence, the verb 'use' is correct. When there is already a comma in any of the punctuation that replaces a conjunction has to be a semicolon. In the above sentence, there is no conjunction. Option 3 makes the sentence incorrect because the sentence is not saying "launched in 2001 in America." "The proportion../'is the subject in the next clause; hence, the verb has to be singular ‘is'.

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