Correct Option: D

flexible (Adjective) : able to change to suit new conditions or situations; able to bend easily without breaking
obstinate (Adjective) : refusing to change your opinion, way of behaving, etc, when other people persuade you to do something ; stubborn ; difficult to get rid of or deal with
confused (Adjective) :unable to think clearly or to understand what is happening or what somebody is saying determined (Adjective) : be firm in doing something and no one can prevent you
trusted (Adjective) : worthy of trust or confidence