Choose the most appropriate option to fill in the blank.
Later when asked about his decision he said, "The first rule of sailing is, when you see _______ in trouble, you help him."
My try:- I got confused in options (a) and (c). Option (c)None can't be used as it doesn't make any sense. Option (d)one can't be used. But I think both the options (a) and (c) make sense.