Answer:
D.
Step-by-step explanation:
Cesar Chavez was a labor leader and an activist who played a vital role in the paying and working conditions of the farmers.
On November 9, 1984, Chavez delivered a speech at the Commonwealth Club of California, San Francisco. In the opening lines of his speech, Chavez mentioned about the accident of Braceros in which 32 Bracero farm-workers died.
He mentioned the Braceros accident that took place twenty-one years ago, in his speech to honor their memory. Braceros were imported from Mexico to make them work in California's farms. The bus on which they were was converted from a flatbed lorry and Braceros farm workers lost their lives.
So, the correct answer is option D.