Incomplete question. However, I inferred how the phrase is used in everyday conversation.
Answer:
The situation was beyond anyone's control.
Explanation:
It is fitting to use this phrase because of what we know about Greenland, it is an area that faces extreme cold weather which is highly uncontrollable.
Thus, the phrase "at the mercy of" suggest that the weather made them vulnerable to any condition.
So you're looking for 2 synonyms. B is the best answer, avert and prevent are synonyms of each other. The other choices are antonyms, or they're at least not synonyms.
The US felt betrayed by Mexico. Germany’s request for money angered the US. Germany’s offer of land posed a direct threat to the US. The US wanted to support Mexico in its conflict with Germany. Germany’s offer of land posed a direct threat to the US.
A counterclaim is a claim that is made to rebut a previous claim.
