hrusher
A, B & D are eliminated, because of wrong usage of verb "saw".
in C & E, "who's" is referring to fenetic guests as well as viewers, which creates ambiguity.
On the other side
frenetic guests ranting on the program,
who's opinions have ranged
who's is referring to the adjacent personal noun which is
frenetic guestsexperts please shed some light
GMATNinja EMPOWERgmatVerbal egmat ExpertsGlobal5 KyleWiddison ScottTargetTestPrep KarishmaBViewers have often turned on the TV and saw guests ranting ...
Both verbs should be in the same tense since they are talking about the same event at the same time.
Viewers have often turned on the TV ... and ...
Viewers have often seen guests ranting ...
We cannot use the simple past 'saw' here.
And as
egmat mentioned above, who's is short for 'who is.' Put that in the sentence and see if it makes sense.
Viewers have often turned on the television and seen frenetic guests ranting on the program, who is opinions range from controversial to absurd.
Makes no sense, right? We use the relative pronoun 'whose' here to show possession.
... frenetic guests, whose opinion range from ...
Now, "whose opinions" refers to "guests' opinions."