Sentence Correction (SC) | Re: The government of Donia has required catalytic converters, devices

The government of Donia has required catalytic converters, devices designed to reduce nitrogen dioxide emissions, in all new cars in Donia since 1993 ,and as a result, nitrogen dioxide emissions have been significantly reduced throughout most of the country.

A. The government of Donia has required catalytic converters,devices designed to reduce nitrogen dioxide emissions, in all new cars in Donia since 1993
B. Since 1993, the government of Donia required catalytic converters,which are designed