A: He was the nineteenth-century grandson of Catherine the Great
B: He was the tsar who finally ended serfdom
C: He opposed the ideas of Enlightenment and liberal changes his entire life
D: He helped defeat Napoleon
Your answer is A) and D) A: He was the nineteenth-century grandson of Catherine the Great, and D: He helped defeat Napoleon. He did not become tsar, and he did not oppose the ideas of the enlightenment and liberal changes his entire life. Hope this helps :D