90% of all doctors are satisfied with the current state of US health care.
B
Between 39.7% and 50.3% of the sample of doctors are satisfied with the current state of US health care.
C
We are 90% confident that the interval from 0.397 to 0.503 captures p = the true proportion of all US doctors who are satisfied with the current state of US health care.
D
A majority of the doctors in the sample are satisfied with the current state of US health care.