What Does Immanuel Kant's Deontological Ethical Theory Mean in Its

What does Immanuel Kant's deontological ethical theory mean in its assertion that people should be treated as an "ends," not a "means?"

A) People are inherently valuable for themselves, not what they can do for you.
B) People are inherently valuable for what they can do for you, not for themselves.
C) People should be used as interchangeable tools for business trading.
D) People should limit their involvement in business trading.