Which of the Following Statements Is True

Which of the following statements is true?

A) A person who chooses to work at a job that pays $40,000 a year instead of a job that pays $80,000 a year is considered (by economists) to be irrational.
B) The wage rate paid in one labor market can affect the supply of labor in another labor market.
C) The wage rate paid in one labor market can affect (albeit indirectly) the wage rate paid in another labor market.
D) The demand for every type of labor is always the same.
E) b and c