Which kanji word is read 「やくそく」?

Answer and explanation

Correct answer: D. 約束

「やくそく」 is written 約束 and means promise.
Answer: 約束.
Why not the others: 紹介: it is read しょうかい and means introduction. 試験: it is read しけん and means examination. 心配: it is read しんぱい and means worry.

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