In Original text "a method to protect warriors against enemy arrows and spears" is a noun modifier modifying military equipment, which is certainly not a method.The original intention of this modifier is to modify "animal-hide Shields"
(A) As explained above
(C)correct.comma with -Ing form correctly modifying the subject of the previous sentence that is "animal-hide Shields" here.Please note that without the comma it would have been wrong.
(E)with the comma before it does not convey the intended meaning.
I too need Kudos sometimes !!!!!!!!!!!