Answer: step-by-step
Step-by-step explanation:
answer: threateningly
in the sentence, the dogs are described as "snarling menacingly, as a pair of eyes drew close." jack london is using imagery to but the reader into the story, seeing the dogs fear. threateningly is another way to say menacingly, meaning they are prepared to do whatever it means for survival.
lmk if this is wrong, good luck!