Which of the following best illustrates the ethos type of rhetorical appeal?

A - If you're unsure about my fit for the job, consider my advanced degree and extensive experience in field work.
B - I'm not just invested in this business; I love every part of it from the customer to the front-line workers to the management community.
C - The most cutting-edge hospitals and medical professionals recommend this type of treatment.
D -You'll make the right decision because you have something that many people do not have: a giving heart.