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In which cases would the speaker in the stimulus be taking a certain thing for granted?
I see that they would state, from their premises, a conclusion that seems to be a bit of a stretch but when I pick that answer, it is wrong.
Examples would be great.

"Takes for granted" = assumes. So, when picking that answer, make sure that someone is actually assuming something in their argument. Of course, an assumption is simply the use of an unstated premise.

Example:

If I say,
"orange has vitamin C therefore you should eat it"

I "take for granted" or "assume" that "you should eat anything that has vitamin C." (this is the unstated premise, or assumption)

Is this clear? I try to make it simple, but not sure if it helps.

It does! Thanks to both of you. That's what I suspected but now I feel more sure.