Which two elements of alexander the second's reforms kept the serfs from gaining political power

It became convenient to use serfdom to explain all Russia’s current weaknesses: it was responsible for military incompetence, food shortages, over population, civil disorder, industrial backwardness. These were oversimplified explanations but there some truth in all of them: serfdom was symptomatic of the underlying difficulties that held Russia back from progress.It was, therefore, a particularly easy target for the intelligentsia, those intellectuals who in their writings argued for the liberalising of Russian society, beginning with the emancipation of the exploited peasants.

As often happened in Russian history, it was war that forced the issue. The Russian state had entered the Crimean War in 1854 with high hopes of victory. Two years later it suffered a heavy defeat at the hands of the Allied armies of France, Britain and Turkey. The shock to Russia was profound. The nation had always prided itself on its martial strength. Now it had been humiliated.

The correct answers are

2 Serfs had to pay landowners a large tax and a fee for loans.

3 The zemstvos in charge of collecting taxes exploited the lower classes.

i am sure the answer is d