Which kanji word is read 「にがい」?

Answer and explanation

Correct answer: D. 苦い

「にがい」 is written 苦い and means bitter.
Answer: 苦い.
Why not the others: 難しい: it is read むずかしい and means difficult. 長い: it is read ながい and means long. 忙しい: it is read いそがしい and means busy.

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