What was the 'Time of Trouble'?

a. the reign of Ivan the Terrible

b. the reign of the Romanov family

c. the period of time when Russia faced continual Mongol attacks

d. a period when neither nobles nor aristocrats could decide on a Russian ruler

The best answer is D

The time of trouble in Russia was a period of political crisis that followed the demise of the Rurik dynasty (1598) and ended with the establishment of the Romanov dynasty (1613).

During this period, foreign interventions, peasant uprisings and attempts by pretenders to seize the throne threatened to destroy the state itself and caused major, social, and economic troubles mostly in the southern and central parts of Russia.

These time of trouble were called Smutnoye Vremya in Russian language.