Question

What does the old -timer from Sulphur creek tell the man in " THE BUILD A FIRE" 

A: TO WATCH OUT FOR WATER HIDDEN BENEATH THE SNOW 
B: TO MAKE SURE TO REMOVE THE ICE FROM HIS DOG'S PAW 
C: TO NEVER TRAVEL ALONE WHEN IT'S COLDER THAN FIFTY BELOW
D: TO PUT FOOD AGAINST THE BODY TO KEEP IT FROM FREEING

Answer 1

TO NEVER TRAVEL ALONE WHEN IT'S COLDER THAN FIFTY BELOW probably this, I read this story before. I'm pretty sure the moral of the story was to not travel alone.

(The answer definitely wasn't remove ice from the dogs paws, that's definitely not it)
In the story the dude did fall in some water hidden under the ice though, and he hid food under his clothes.

Answer 2

What the old man from Sulphur creek tells the man in "To Build a Fire" is to never travel alone when it's colder than fifty below

Step-by-step explanation:

In the story of "To build a Fire" by Jack London, a man begins a travel when the weather is really cold and everything around is cover by snow, the man sees him and warns him not to do so, since it is extremely dangerous to travel alone under those conditions, there where a lot of dangers out there and nobody could help him if he was alone.