There are five ways to handle conflict based on degree of cooperativeness and assertiveness.
competition, collaboration, compromise, avoidance and accommodation.
Accommodation is the mode when there is low assertiveness and high cooperativeness.
since jeff is not highly assertive as he doesn't had strong opinion while nothing is given about Den we can assume that jeff will be cooperative to reach to a consensus and hence accommodation will be most suitable mode here.
Withdrawal is a psychological defence mechanism which is a psychoanalytic term meaning the tendency to escape from situations that may be experienced as emotionally or psychologically challenging
