When Assessing a Client's Vital Signs, a Nursing Student Has

When assessing a client's vital signs, a nursing student has explained each of her next actions prior to assessing the client's temperature, pulse, and blood pressure. However, the nurse has not announced her intention to assess the client's respiratory rate prior to measuring it. Which of the following is a plausible rationale for the nurse's decision?

A) Respirations have both autonomic and voluntary control.
B) The nurse likely assessed the client's respiratory rate simultaneous to heart rate.
C) Temperature, pulse, and blood pressure are more volatile than respiratory rate.
D) Tachypnea is an expected finding among hospitalized individuals.