Why did nationalism backfire for Bismarck? A: The economy was dismal, and the workers blamed Bismarck for it.
B: The creation of the Triple-Alliance caused nationalism to backfire.
C: They lost the Franco-Prussian war.
D: There was feuding between Bismarck and Wilhelm II.

Its a The economy was dismal, and the workers blamed Bismarck for it.

Explanation:

Because if you read through the part where it talks about the Bismarck then you would have seen it good day

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The Nullification Crisis. Calhoun's pamphlet sparked a national debate over the doctrine of nullification and its constitutionality. ... Jackson supported states' rights but viewed nullification as a prelude to secession, and he vehemently opposed any measure that could potentially break up the Union.

Explanation: hope this helps