Which of the following is the best title for the text

A．animals feel pain because their pupils dilate, their pulse rate and blood pressure rise
B．when body stimuli are isolated from the higher nervous centres, animals won't withdraw the stimulated limb
C．we will never know whether or not animals feel pain because they cannot speak
D．people conduct a lot of experiments on animals in order to get knowledge of pain

A．developing public appreciation for science
B．establishing approaches to the examinations of unusual claims
C．encouraging critical thinking among the reproducers or publishers
D．monitoring the media by presenting scientific proofs