The support group for mothers of soldiers emphasizes in its introductory l
iterature that acts of heroism have been performed every day by young
men and women born of American families.

A:...
B: every day have been performed by young men and women, born in
American families
C: are performed, every day, by young men and women born of American
families
D: are performed every day by young men and women born in American
families
E: are performed every day by young men and women born of American
families

Source: GMATCLUB Verbal test
Can someone please explain the tenses at play here. "have been / are been"
Also, the correct idom between "born in / born of"
OA is: D