How was the hereditary caste system closely connected to hindu beliefs in reincarnation?

The Indian caste system is the caste-driven social system that has evolved in India over several thousand years. This is a system enshrined in Hindu scriptures, traditions and legal texts, but also tried to change through activism, legislation and religious reform.

The religiously-based denomination of the community contains four caste groups called varna: Brahmins (priests), Kshatriyas (warriors), Vaishyas (traders) and Shudras (workers). This section runs across geographical and linguistic lines.

Indian legislation since its independence in 1947 has sought to improve the laity of the low castes. In modern urban societies, education, the media, modern working life and politics have also led to caste having less meaning than it used to be, but in rural areas and in certain contexts (relationships, marriage, politics, etc) it can still be particularly relevant.

ok sorry the answer is a. by their religion