Mark the letter A, B, C, or D to indicate the sentence that best combines each pair of sentences in the following questions

Most children aged 5 to 11 in England go to primary schools. These schools are largely co-educational. 

• A. 
  Most children aged 5 to 11 in England go to primary schools, which are largely co-educational.
• B. 
  Most children aged 5 to 11 in England go to primary schools, who are largely co-educational.
• C. 
  Most children aged 5 to 11 in England go to primary schools, that are largely co educational.
• D. 
  Most children aged 5 to 11 in England go to primary schools, where are largely co-educational.