单项选择题

DNA链的碱基序列5'-TCAGAT-3'经 RNA聚合酶催化转录生成的RNA链的碱基序列是

A.5'-CUAAGU-3'
B.5'-AGUCUA-3'
C.5'-AGTCTA-3'
D.5'-AUCUGA-3'
E.5'-ATCTGA-3'