In reference to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often expressed anxiety that participants are increasingly contacting their family and friends and are even having friends visit them; these actions make such participants much more difficult to protect.
(A) In reference to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often expressed anxiety that
(B) When referring to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often express anxiety about
(C) With reference to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often expressed anxiety about
(D) Referring to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often expressed anxiety that
(E) Referring to the current trend of an increasing number of Witness Protection Program participants being "outed", officials often express anxiety that