19. The herbicide Oryzalin was still being produced in 1979, three years after the wives of workers producing the chemical in Rensselaer, New York, were found to have borne children with heart defects or miscarriages, and none of their pregnancies was normal.

(A) to have borne children with heart defects or miscarriages, and none of their pregnancies was

(B) to have had children born with heart defects or miscarriages, and none of the pregnancies was

(C) either to have had children with heart defects or miscarriages, without any of their pregnancies being

(D) either to have had miscarriages or to have borne children with heart defects; none of the pregnancies was

(E) either to have had miscarriages or children born with heart defects, without any of their pregnancies being

Answer D,

but i dont understand the un-underlined verb: were

what is the subject for were??

~~thanks ~~