During the colonial rule, caste system became more rigid and institutionalised because of the following developments.

A. The colonial government was caste-blind
B. Intensive surveys and reports on customs and manners of castes
C. Caste based Census by Risley in 1901
D. Land revenue system and related laws that recognised customary rights of upper castes
E. Welfare of 'depressed' classes through the Government of India Act, 1935

Choose the correct answer from the options given below:

B, C, D, E only