Sentence Correction (SC) | Re: Primary schooling is almost universal, and today

A) Primary schooling is almost universal, today, three out of four children are enrolled in pre- and secondaryschool.
This sentence has two independent clauses without conjunction so it is fragment.

B) Three out of four children are enrolled in both pre- and secondary school and it is almost universal today.
"it" is ambiguous. It refers to "pre-school" or "secondary
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