Which sentence uses pronoun case correctly?

What would be a good starter sentence for writing a review over hidden figures?

Which of these sentences exhibits proper usage? a. many doctors affiliated with university hospital expressed concern about the policy (moore 5). b. many doctors affiliated with university hospital expressed concern about the policy (moore 5). c. many doctors affiliated with university hospital expressed concern about the policy (moore 5). d. many doctors affiliated with university hospital expressed concern about the policy (moore 5).

What do u think u might go with a bestfriend that u don’t do with everyday friends( school friends)