Which of the following is a secondary source about the life of Mohandas Gandhi (1869–1948)?

Select one:

- an audio recording of an interview that Gandhi gave to a journalist, taken in 1946
- a book about how Gandhi influenced the American civil rights movement, written in
1970
- a photograph of Gandhi leading a protest taken in 1930
- a speech that Gandhi delivered to the Indian National Congress, written in 1921