Woolf articulates/makes heed to conventional notions of truth: in her words, one cannot receive from any lecture "a nugget of pure truth" to wrap up between the pages of one's notebook and keep on the mantelpiece forever should fit in the answer.

C and D are the answers.
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Cos She is making fun and hence the clue-"a nugget of pure truth" to wrap up between the pages of one's notebook and keep on the mantelpiece forever.

therefore C and D--

Makes light of and mock.. To make fun of something

"To make light of" essentially means to mock or not take something seriously

Answer has to be C & D , Major Giveaway in the question is W's thought of Hardly gaining any truth to be wrote down or remembered , So it has to be something She fails to give any Heed or Value.

Other Options infer the Opposite meaning.

Can any please share some ways to predict the answers correctly

Well, not really. There is not a proper clue word/s to predict the answer. The only way is to grasp the meaning of the sentence as a whole.

Woolf ____________ conventional notions of truth: in her words, one cannot receive from any lecture "a nugget of pure truth" to wrap up between the pages of one's notebook and keep on the mantelpiece forever.

From this, you can infer that the real meaning is she plays with the truth and that this truth is always somehow changing.

I.E she plays with the standard truth. The standard truth (whatever it means) you take for granted and cast in stone.

She instead mocks (has a joke) of the truth. The akin word to pair with mock is makes light of.

Hope now is more clear to you.

Regards
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i dont get it .. why 'to make light of'?