Which of These Follows from the Theory of Relativity

Multiple Choice

Which of these follows from the theory of relativity?

A) Mass is relative to one's frame of reference.
B) Time is relative to one's frame of reference.
C) Length is relative to one's frame of reference.
D) Mass, time, and length are all relative to one's frame of reference.
E) None of these things are relative to one's frame of reference.