一个菜鸟的语法问题。

lazydog

Sand is formed by the weathering and decomposition of all types of rock, ------ most abundant mineral constituent being quartz.

A. and its

B. since its

C. its

D.it is

答案为什么是C啊？这句话的正常语序应该是什么啊?

gre3333

分词做定语，修饰rock。是正常语序。