Help, please. BRAINLIST if correct

The best choice is option A. A section is a history textbook covering the Freedom Riders.

Explanation:

Option B shows proof of the Riders and their protests and was taken at the time they were protesting, this is primary source. Option C is primary as well as it gives us a firsthand experience of the Riders's experience since he is writing to his brother. Option D is primary too because the news covered interviews from actual Freedom fighters. So this leaves us with option A, which is a secondary source as the textbook is written by people who researched and compiled information on the Riders' protests.

answer: what was the us involvement in ww1? although the u.s. tried to remain neutral when ww1 broke out, it finally joined on april 6, 1917 after declaring war on germany. the reason for america to become involved in ww1 was germany's unrestricted submarine warfare, which had already sunk several american merchant ships.

explanation:

i believe the answer would be 1.