有关如图河流地貌的形成,正确的是( )
A:甲为凹岸侵蚀,乙为凸岸堆积
B:甲为凸岸堆积,乙为凹岸侵蚀
C:甲为凹岸堆积,乙为凸岸侵蚀
D:甲为凸岸侵蚀,乙为凹岸堆积
Would you please help me pick up ____umbrella on the floor?