Should be C
Since 1945, the United Nations, an organization with 192 member states has worked to promote economic development and it is an important international issue.
Error analysis:
Here "an organization with 192 member states" is an appositive describing united nations. Since this modifier is preceded by a comma therefore a comma must follow. Here pronoun it is ambiguous. Here it seems to refer to economic development but starting a separate clause makes it ambiguous and detached.
...
Since 1945, the United Nations, an organization with 192 member states has worked to promote economic development and it is an important international issue.
Error analysis:
Here "an organization with 192 member states" is an appositive describing united nations. Since this modifier is preceded by a comma therefore a comma must follow. Here pronoun it is ambiguous. Here it seems to refer to economic development but starting a separate clause makes it ambiguous and detached.
...
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