Expanded russian borders, promoted education among the people of russia, and improved russia’s economy.
a. maria theresa
c. catherine the great
b. peter the great
d. frederick the great

Catherine the Great expanded Russian borders, promoted education among the people of Russia, and improved Russia's economy. The correct option among all the options given in the question is option "c". Yekaterina Alexeyevna or popularly known as Catherine the Great was born on 2nd of May in the year 1729 and died on 17th of November in the year 1796. She ruled Russia from the year 1762 until the day of her death. Russia became stronger and larger under her rule.