This Is Not Who We Are commonlit answers

Iopened the door quietly,then stood in the doorway rewrite using ..ing participle

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).

Read the passage and choose the correct punctuation marks