Catherine the Great of Russia did all of the following, EXCEPT a. favor the landed nobility.
c. enlarge the Russian Empire.
b. expand serfdom.
d. reform the law code.

Increase Russian Productivity or your option C.

Explanation:

i confess that there are several parts of this constitution which i do not at present approve, but i am not sure i shall never approve them: for having lived long, i have experienced many instances of being obliged by better information or fuller consideration, to change opinions even on important subjects, which i once thought right, but found to be otherwise. it is therefore that the older i grow, the more apt i am to doubt my own judgment, and to pay more respect to the judgment of others.