A)He made a sudden turn.
B)He drove the bus over a bicycle.
C)He tried to avoid hitting the truck.
D)He was driving too fast.
原文：
W:Mr. Wilson,you said you saw the bus crash into the truck. Do you know what caused the accident?
M:I saw a boy riding his bicycle in the street. The bus driver tried to avoid bitting him.He made a sudden turn and lost control the bus.
Q:What caused the bus driver to loss control of the bus?