The correct answer is D. A journal written by a black South African describing his experiences with apartheid policies.
Step-by-step explanation:
A primary source acts as an immediate account. This means, the source is created by someone who witnessed/experienced the event, and it is created shortly after the event. This does not occur in secondary sources as in these, the author uses a primary source to create another source such as a summary, essay, report, etc.
From the options, the primary source is "A journal written by a black South African describing his experiences with apartheid policies" because the author of this source is directly describing an event he/she experienced, which means the source is an immediate and first-hand account.