Read the sentence in Paragraph 11 in the article The Fight in the Fields: Cesar Chavez and the Farmworkers' Struggle.

“At its height, over 13 million Americans supported the Delano grape boycott.”

What does the boycott mean as it is used in the sentence?

A
To disagree with an opinion
B
To make to support a cause
C
To vote in support
D
To refuse to buy in protest