Answer:
Correct answers are:
C. Peter the Great expanded the navy, furthered educational opportunities, and increased his territorial boundaries.
D. Maria Theresa of Austria preserved her power against challenges by Frederick Il of Prussia. She strengthened Austria by improving the bureaucracy and the methods of tax collection.
Step-by-step explanation:
First option is not correct as there was no War of Westphalia in which he participated. There was a famous peace there much earlier in 1648. Serfs didn't gain freedom in Russia back then. It was abolished in 1861.
Second option is not correct as Austria didn't spread in those areas, and Maria never fought with Norway.
Third option is correct as Peter created a strong army and spread his country towards Black and Baltic Sea. He was the greatest Russian ruler of the time. As he traveled lot across Western Europe, he introduced many changes, even in the educational system.
Fourth option is correct as she managed to drive off the largest opponent in that period, and that was Prussia. They fought in a famous war for Austrian heritage. Her son Joseph and Maria made many reforms that strengthen the country.