The definition of the word 'Yankee'' is relative. To a Mexican, a Yankee is anyone north of the Rio Grande - that is, any American. In the South, a Yankee is anyone from north of the Mason-Dixon Line. North of the Mason-Dixon Line, a Yankee is someone from New England. In New England, a Yankee is someone from Vermont. In Vermont, a Yankee is someone who e apple pie for breakfast Considering the anecdote above, which of the following statements about social identity is true?
A. There are no boundaries when defining the identity of a person or group.
B. It forms when people agree on what distinguishes themselves from others.
C. Social identity is static, and once it's defined it cannot be changed
D. Social identity means the same thing to all people, regardless of location