What was the most challenging issue or event for President Van Buren’s

What was the most challenging issue or event for President Van Buren’s political fortunes?

A) the growing movement supporting abolitionism in the North and Congress
B) avoiding war with Great Britain when rebels in Canada recruited volunteers along the American side of the Great Lakes
C) resisting political pressure to annex Texas and Oregon from his colleagues in his Democratic Party
D) the major economic downturn caused by the Panic of 1837

ANSWER
Answer: D