请教Prep 2，139（2，5考试，急！ 谢谢）

各位帮我看看这道题

Taste buds are onion-shaped structures with between 50 and 100 taste cells, each of them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore.

(A) them has fingerlike projections poking through the opening located at the top of the taste bud called the taste pore （each of them 是主语，

(B) them that have fingerlike projections that poke through an opening located at the top of the taste bud, which they  call the taste pore

(C) which has fingerlike projections poking through the opening, called the taste pore, located at the top of the taste bud

(D) which having fingerlike projections that poke through an opening, which is called the taste pore, located at the top of the taste bud

(E) which have fingerlike projections that are poking through an opening located at the top of the taste bud called the taste pore

关于C 选项，called ,located ,是不是都是修饰fingerlike projections呢，如果是的话，他们中间是不是需要连词阿，如果不是的话，这两个又分别充当什么成分呢，谢谢啦

谢谢plato1983及时答复，。　那called , located 这两个既然都是修饰the opening 的，为什么中间不加一个“and " 连词呢，