15 Regarding the process of German unification prior to 1871, which of the following statement is incorrect?
(A) The Customs Union led by Prussia helped to pave the way to national unification.
(B) Prussia, excluding Austria’s involvement, provoked the war against Denmark over sovereignty dispute
of Schleswig and Holstein in 1864.
(C) Prussia adopted a lenient policy toward Austria after their war so as to reduce hatred and resistance
from Austria.
(D) Napoleon III forced Prussia not to intervene into the succession of Spanish throne, resulting in their
worsening relationship and consequently into war.