Hi Ron,
Your posts are very much helpful.
I correctly answered this question by selecting options C.
But I have some doubts regarding option D.
Option D is given as:
Marconi conceived of the radio to be a tool for private conversation, a substitute for the telephone, which has become precisely the opposite
So when I come across this option, I checked 'which' refers to what? It can either refer to private conversation or telephone(because it is in modifier phrase).
Then I checked what non-under line portion will say if option D is correct.
"[private conversation or telephone], which has become precisely the opposite"
Neither telephone nor private conversation makes sense with this option so I marked it as wrong.
So my question is the way I marked option D is correct??
Do you see any knowledge gap in my above explanation?
Regards,
Chetan