Correct answer: A. It was difficult to control all regions
Explanation: The Russian Empire covered a very large area and included many different peoples, languages, religions, and local conditions. A government ruling such a territory had to communicate across long distances, move officials and soldiers, collect taxes, and enforce laws in distant regions. These tasks were difficult even in ordinary times and became harder when people were dissatisfied or when transport and administration were weak. Size alone did not cause every problem, but it increased the challenge of maintaining effective central control.
Option A is correct because the empire’s vastness made it difficult to control all regions from the centre. Option B is wrong because the population was not linguistically and culturally uniform. Option C is obviously false, since the Russian Empire was enormous rather than a single village. Option D ignores the real administrative challenge. Thus, the question tests how geographical scale and diversity weakened the ability of Tsarist rule to govern effectively.