Which international agreement signed in 1713 concluded the War of the Spanish Succession and helped establish the principle of the balance of power in Europe?

The question asks for the international agreement signed in 1713 that concluded the War of the Spanish Succession and helped establish the principle of the balance of power in Europe.

• The Treaty of Ghent (A) was signed in 1814, ending the War of 1812.
• The Treaty of Utrecht (B) was a series of peace treaties signed in 1713 and 1714 that ended the War of the Spanish Succession and significantly reshaped the European political landscape, establishing a new balance of power.
• The Treaty of Aix-la-Chapelle (C) was signed in 1748, ending the War of the Austrian Succession.
• The Treaty of Westphalia (D) was signed in 1648, ending the Thirty Years' War and the Eighty Years' War.

Based on the date and the events described, the correct treaty is the Treaty of Utrecht.

The correct answer is B.
$\boxed{\text{B. The Treaty of Utrecht}}$