Can you check my answers please?

Which of these geographical factors is MOST LIKELY the biggest hindrance on Russia's economy?
Responses
A Russia's proximity to the Bering SeA
B permafrost over much of Siberia***
C large deposits of oil and natural gas
D Russia being the largest country in the world

2 answers

Yes, your answer is correct. The permafrost over much of Siberia is most likely the biggest hindrance on Russia's economy.
Russia's proximity to the Bering Sea