Identify when to go for extreme case

Can someone please tell me when to look for extreme cases like in this TC. I usually don’t understand and giving me hard time.

Like in this :
image

“She was always kind, but people were still surprised by her kindness”
So the answer has to be either a synonym of young or a synonym of impressionable, thus (a)

Is there any keyword which indicate extreme cases or they’re entirely based on essence of the sentence.

“nevertheless”

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