Which is the best way to write the underlined portion of these sentences?

— ExhibitC

Sentences 5 and 6:Newer models are more accurate than the earlier devices.Which were plagued by false alarms.

Which is the best way to write the underlined portion of these sentences? If the original is the best way, choose optionA.

A. devices.Which were

B. devices.And were

C. devices, who were

D. devices, those which are

E. devices, which were

Answer: E