which of the following molecules is polar?

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which of the following molecules is polar?
A,BH3
B,NF3
C,C2H6
D,SF6
E,CCL4 C,D选项我明白,是空间结构造成没有net pole.其它选项呢?BH3的结构是trigonal planar ,每个键的夹角120度抵消pole么?其他的呢?
写错了，是C，E选项我明白

A是等边三角形结构,没极性,B在中间,三个H为三个角
B是三角锥,N上面有一对孤对电子和三个F占据四面体的四个角,整体来看就是三角锥,有极性
D是正八面体结构,S在中间,F占据6个角,无极性

Which of the following is Which of the following sentences is correct? 5.Which of the following is wrong?... Which of the following sentences is wrong? which of the following sentences is incorrect? Which of the following sentences is right? which of the following is true?中文 Which of the following is correct? Of the following which is correct? Which of the following is Not Correct? Which of the following sentence is right? Which of the following statements is true?