The word 'unfathomable' means not able to be understood.
to 'fathom' is to think or ponder on something so as to understand it.
The answer is c)
Explanation:
Americans worked hard in factories to produce more equipment for the war effort.
White Fang came in until he touched Gray Beaver's knee
At the sound, Kiche leaped snarling to the end of her stick, and there raged terribly because she could not come to his aid. But Gray Beaver laughed loudly
Both nose and tongue had been scorched by the live thing, sun-colored, that had grown up under Gray Beaver's hands
