PLEASE HELP!! what is the best definition of the caste system

a. the hindu belief that life cycle is a cycle of birth, death, and rebirth, which ends only when a person reaches nirvana

b. an integral part of hinduism that teaches that the gods will allow people who pray to the wheel of dharma to change their social standing

c. a teaching of siddhartha gautama based on his realization that the only way to avoid suffering is to follow the eightfold noble path

d. social and religious classes developed after aryans settled on the ganges plain and later incorporated into hindu beliefs

Which fact from the tinker v. des moines court decision best supports the reasoning that the conduct of the student protesters was protected by the fourteenth amendment, which prohibits deprivation of life, liberty, or property? o a. the record shows that students in some of the schools wore buttons relating to national political campaigns, and some even wore the iron cross, traditionally a symbol of nazism. o b. on the other hand, the court has repeatedly emphasized the need for affirming the comprehensive authority of the states and of school officials, consistent with fundamental constitutional safeguards, to prescribe and control conduct in the schools. c. the action of the school authorities appears to have been based on an urgent wish to avoid the controversy which might result from the expression, even by the silent symbol of armbands, of opposition to this nation's part in the conflagration in vietnam. d. that they are educating the young for citizenship is reason for scrupulous protection of constitutional freedoms of the individual. if we are not to strangle the free mind at its source and teach youth to discount important principles of our government as mere platitudes.