There are hundreds of islands ________ the coast Fujian, the biggest of ________ is not far from the

There are hundreds of islands ________ the coast Fujian, the biggest of ________ is not far from the main land．

A.on, which

B.off, them

C.off, which

D.on, them

答案及解析： C

解析：

离海岸多远，常用介词off，分句为非限定性从句。