Answer:
B. A determined person
Step-by-step explanation:
When choosing a phrase with a positive connotation, you are choosing the phrase that is associated with being good.
A stubborn person would have a negative connotation because being "stubborn" means that a person will not change their ways or comply with others. An obstinate person would also have a negative connotation as someone who is "obstinate" refuses to change their ways or opinions even after being told to do so.
This leaves a determined person who would have a positive connotation. Being determined means that a person is willing to follow through with their plans and achieve their goals, making a positive connotation.