The sentence given is divided into four parts. Identify the part with an error:
The reason (1) / why she is absent today (2) / is because (3) / her husband is ill. (4)
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Avoid using "the reason... is because" as it creates redundancy.
The phrase "is because" should be corrected to "is that." Saying "The reason why... is because" is redundant. The correct phrase is "The reason why she is absent today is that her husband is ill."