Over 60%of pupils in South African schools choose English for learning and teaching, but only 7%of pupils speak English as their home language, a recent South Africa survey shows. Out of the country's 12.2 million pupils only 851,536 speak English at home, yet 7.6 million pupils choose English as their favorite language of learning and teaching. Zulu is the most widely spoken home language, spoken by over 3.1 million pupils. However, less than a third of them choose to be taught in Zulu. The same thing is true of Pedi-speaking pupils, only a third of such pupils choosing to be taught in their home language. Besides English, Afrikaans is the only language that has more pupils choosing it as their language of instruction than it has pupils who speak it at home. In primary schools, most pupils will choose African languages. As early as grade four, many would choose English or Afrikaans in their lessons. The rising number of English-learning pupils is mainly caused by social and cultural reasons. English is the most common spoken language in official and public life in South Africa, the survey reports. In April 2011, the leaders of higher education and training said that they would take some steps to improve the university teaching and prevent the continuing _ of African languages. They suggested that in future every South African university student could be required to learn at least one African language in order to complete their studies at school. What is the survey in the passage mainly about?
The use of native languages in South African families. The language choice and use among South African pupils. The progress in South Africa's language teaching education The spread of English at schools in South Africa.