C vs D
According to Original sentence, words "world per-capita income now approaches' conveys a meaning that income approaches to a level in current scenario.
Present perfect tense in choice C 'has been approaching' distorts the meaning to 'income started approaching in the past and continue to do so'.
And, simple present in Choice D 'is approaching' resonates with Original sentence.
Hence, Choice D is correct.
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...
According to Original sentence, words "world per-capita income now approaches' conveys a meaning that income approaches to a level in current scenario.
Present perfect tense in choice C 'has been approaching' distorts the meaning to 'income started approaching in the past and continue to do so'.
And, simple present in Choice D 'is approaching' resonates with Original sentence.
Hence, Choice D is correct.
Posted from my mobile device
...
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