The correct option is D. Rule by foreign nations led to the group Young Italy being unhappy. It was Founded in 1831 by Giuseppe Mazzini.
By encouraging a mass uprising in the reactionary states of Italy and the areas controlled by the Austrian Empire, the movement aimed to establish a single Italian republic. Mazzini thought that a public insurrection would lead to the unification of Italy.
Thus, the reason behind the formation of the group Young Italy is that rule by the Austrian Empire that led to the formation of the Young Italy group. Mazzini thought that a public insurrection would lead to the unification of Italy.
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