Questions 14～16 are based on the following conversation. You now have l5 seconds to read questions 14～16. What’s the relationship between Tom and Steve

A．scientific subjects, emotional words are often used to make meaning clearer______.
B．debatable questions, objective terms are generally used to help clarify meanings
C．scientific subjects, objective terms are generally used, in groups to avoid controversy
D．debatable questions, emotional terms are used very often

A．agreement
B．argument
C．discussion
D．contribution