According to Rosser and Institutional Economics, institutions are...

A.

settled habits of thought common to the generality of human (by which human dictate their lives)

B.

customs, laws, rules, procedures, usages, practices, routines, observances, rituals, sanctions, taboos, codes, conventions, precepts, obligations, rights, duties and beliefs.

C.

Subjects of study in comparing different economies.

D.

All of the above.