请选择ABC2n,l'Z7o1e7O4J7D)g-E0^0m This is ______ umbrella. It’s ______ big umbrella.(_3U4z+M7r.u'I/A/E:`
A. an, a(_3U4z+M7r.u'I/A/E:`
B. a, a(_3U4z+M7r.u'I/A/E:`
C. an, an(_3U4z+M7r.u'I/A/E:`