ETS全真题中有一道语法题是这样的:

The concept of television___images over distances,had intrgued scientists even before the invention of moving picutures or radio.

(A) the transmission of

(B) transimits to

(C) for transmission

(D) the transmitting

答案选a,可我不明白为什么,请牛人指教.(两个名词性词组之间没有连词,也没有逗号可以吗?我晕)