In the Years Before Lenin's Death, What Approaches Advocated by Trotsky

In the years before Lenin's death, what approaches advocated by Trotsky did Stalin publicly oppose?

A) collectivizing agriculture and focusing on revolution only in domestic spheres
B) further limiting the rights of the press and the right to protest
C) encouraging communism abroad and forcing rapid industrialization
D) implementing the eight-hour work day and offering free public education
E) expanding free market systems and forming an alliance with Germany