okay im gonna fail in earth science and i really need help and bout to cry cause im still on this quiz i did it 4 times already and im on my 5th try on it and im 2 lessons behind and i need to do a unit test in earth science oh please helpppp

Which causes a meander to form in a river?
A.the deposition of sediments at the place where a river flows into an ocean
B.the erosion of rock where a river flows over it and erodes the softer rock
C.the deposition of sediments on a wide, sloping area at the bottom of a mountain
D.the movement of the river through easily eroded rocks or sediments

please help me i would literally help you with your homework all day!

and theres 4 more questions to.

B. the erosion of rock where a river flows over it and erodes the softer rock