Which of the following is an angle subtraction postulate that can be derived from the angle addition postulate m∠QRS + m∠RST = m∠QRT? A) m∠QRT = m∠RST – m∠QRS B) m∠QRS = m∠RST – m∠QRT C) m∠RST = m∠QRT – m∠QRS D) m∠QRS = m∠RST