PREP有一道难题不解？

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

A.
            them has fingerlike projectives poking through the opening located at the top of the taste bud called the taste pore

B. them that have fingerlike projectives that poke through an opening located at the top of the taste bud, which they call the taste

C. which has fingerlike projectives poking through the opening, called the taste pore, located at the top of the taste bud

D. which having fingerlike projectives that poke through an opening, which is called the taste pore, located at the top of taste

E. which have fingerlike projectives that are poking through an opening located at the top of the tasted bud  called the taste pore

答案选C, 我认为 A 更加准确。请各位高手帮我解答一下！谢谢了