When Conducting Experiments on the Physiological Component of Emotions,one Has

When conducting experiments on the physiological component of emotions,one has to be very careful about interpreting the data because

A) the nervous system is not a reliable bodily system to test.
B) the physiological tests that measure the responses of the nervous system are not likely to accurately assess a person's physiological states.
C) the emotion that corresponds to a specific reaction in the nervous system is not always clear.
D) emotions are rarely thought to have a physiological component in today's research.