Answer:
A. He repeats short sentences to highlight the critical nature of the moment.
Step-by-step explanation:
Nelson Mandela was the first Black president of South Africa, elected after his time in prison for anti-apartheid activity. The given excerpt is from his Inaugural Address as President of South Africa from 1994.
Here he uses short, clear sentences to highlight the critical nature of the moment. He doesn't use complicated phrases as he wants people to understand him and his beliefs. He doesn't want anyone to forget the past or the people who fought for justice, because they are the reason a change was made.