Why do you think the members of the national party were angered by Botha reforms?​

The first leader of the National Party (NP) became Prime Minister as part of the PACT government in 1924. The NP was the governing party of South Africa from 1948 until 1994, and was disbanded in 2005. Its policies included apartheid, the establishment of a South African Republic, and the promotion of Afrikaner culture. NP members were sometimes known as ‘Nationalists’ or ‘Nats’.

The feature includes a history of the National party, broken down into sections, according to significant periods of the NP’s history. An archive section listing and linking to relevant speeches, articles, documents and interviews. Featured is also a people section that lists all of the key figures and members of the NP, with links to their relevant biographies.
Got info from https://www.sahistory.org.za/article/national-party-np to look up for more information

Good luck: )