He explained the reason........ he was late.(that/who/why/which) Which one is correct?

July 18, 2017
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#$%@4-
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255
![]() I think 'why'.
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Pammi
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25748
![]() why
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Ayatoullah
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6386
![]() why
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#$%@4-
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1051
![]() why
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#$%@4-
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260
![]() why
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#$%@4-
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62
![]() 'why' is the correct answer .
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#$%@4-
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-3
![]() that
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Harwinder Singh
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9
![]() why
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#$%@4-
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250
![]() I think why
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#$%@4-
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-3
![]() why
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