Which factor played a major role in the decline of Bismarck's alliance system?

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The irreconcilable interests of Austria-Hungary and Russia played a major role in the decline of Bismarck's alliance system. Bismarck had managed to keep these two powers from going to war with each other through a network of alliances, but when he was no longer in power, these alliances fell apart due to their conflicting interests. This led to a realignment of alliances in Europe and ultimately contributed to the outbreak of World War I. German domination over the Balkans was not a major factor in the decline of the alliance system, and while Bismarck's foreign policies were inflexible, this was not the primary reason for the decline. Bismarck was also a skilled diplomat, so his lack of diplomatic skill is not a likely factor.

Which Factor Played a Major Role in the Decline of Bismarck's