A. has encountered a series of unexplainable symptoms that were attributed to
"A number of military personnel" is plural so "has" is wrong
B. has unexplainably encountered a series of symptoms that have been attributed as
"A number of military personnel" is plural so "has" is wrong
C. have encountered a series of unexplained symptoms that have been attributed as
"unexplained" is not necessarily wrong IMO but "unexplainable" suits more
...
"A number of military personnel" is plural so "has" is wrong
B. has unexplainably encountered a series of symptoms that have been attributed as
"A number of military personnel" is plural so "has" is wrong
C. have encountered a series of unexplained symptoms that have been attributed as
"unexplained" is not necessarily wrong IMO but "unexplainable" suits more
...
![FLO – Therapy at the Club – Pre-Single [iTunes Plus M4A]](http://is1-ssl.mzstatic.com/image/thumb/Music221/v4/a4/11/88/a41188ed-0f2e-e8d5-1163-d59e373cc58c/26UMGIM30046.rgb.jpg/208x208bb.webp)
