悪天候により、飛行機の到着が__________遅れている。
• 軒並み
• 足並み
• 人並
• 月並み

悪天候により、飛行機の到着が__________遅れている。
(あくてんこうにより、ひこうきのとうちゃくが{(choices)}おくれている。)
(Due to bad weather, the arrival of airplanes is delayed)

The question is asking about how the delay is affecting the flights.

The correct answer is 軒並み (nokinami), which means "across the board" or "universally".

In the given sentence, the speaker is explaining that the arrival of airplanes is delayed due to bad weather. The phrase "悪天候により" (akutenkou ni yori) means "due to bad weather," and the sentence is asking about how the flights are affected by it.

• Option 軒並み (nokinami) means "across the board" or "universally" and is the most appropriate answer. This phrase indicates that the delay is not limited to a few flights, but rather that all flights are affected.
• Option 足並み (ashinami) means "pace" or "step" and is not applicable to the situation of delayed flights.
• Option 人並み (hitonami) means "average" or "typical" and does not make sense in the context of the sentence.
• Option 月並み (tsukinami) means "commonplace," and is also not relevant to the context of the sentence.

Therefore, the most appropriate option is 軒並み (nokinami), which conveys the idea that all flights are delayed due to bad weather.