Some parts of a sentence have been jumbled up, and labelled P, Q, R and S. Select the option that gives the correct sequence in which these parts can be rearranged to form a meaningful and grammatically correct sentence. The Government reforms imposed by P. series of major social, political, legal and Q. the Great Reforms by historians, were a R. governmental reforms in the S. Tsar Alexander II of Russia, often called Russian Empire carried out in the 1860s.