History Question?? Age of Jackson???

Question:An important cause of the Panic of 1837 was the
[a] end of the frontier
[b] shortage of paper money
[c] building of the Baltimore and Ohio Railroad
[d] speculation in Western lands

please help me
i really appreciate it

Best Answer - Chosen by Asker: An important cause of the Panic of 1837 was the
[a] end of the frontier
[b] shortage of paper money
[c] building of the Baltimore and Ohio Railroad
[d] speculation in Western lands

please help me
i really appreciate it

I'm pretty sure the answer is B