Why is the worldbabushka in quotation marks

Peter's grandmother often wore a "babushka," or a headscarf tied below the chin, which was a common accessory among elderly Russian women. Why is the word "babushka" in quotation marks? A. Because it reflects the author's personal writing voice.

Because it is a word that may be unfamiliar to audiences

i think the answer would mist likely be an adjective clause, because unhappy is an adjective.

иσ σиє тяυℓу киσωѕ ιf нє ∂ιє∂, кαωαкι кιℓℓє∂ нιм ιи тнє мαиʝα тнσ