Following a collision or accident，the Mast
题型：单项选择题
问题：
Following a collision or accident，the Master of each vessel involved must render assistance to persons affected by the collision or accident（）.
A.if he can do so without any risk to his vessel
B.if he can do so without undue delay
C.if he can do so without serious danger to his vessel or to individuals on board
D.without regard to any danger to his vessel