The reason he is late isthere was a breakdown on the railwayA. why; thatB. because; thatC

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(答案→)A. why; that
B. because; that
C. that; because
D. why; why
解析：经过分析句子结构，可知这个句子中包含一个定语从句和一个表语从句。关系词在定语从句中作原因状语，故用why。引导词在表语从句中不作任何成分，且没有实际意义，故用that。