Milites, quorum pars vulnerata est, ex acie recesserunt.
acies, -ei, f.: battle line recedo, -ere: to withdraw
In the phrase quorum pars, the genitive quorum indicates
- that the soldiers possess the part that was wounded
- the whole group from which a part is being taken (correct answer)
- a quality or description of the wounded part
- the part that is acting upon the soldiers
Explanation: Quorum is a partitive genitive (or genitive of the whole). It specifies the whole group (quorum referring to Milites) from which a portion (pars) is taken. While possession (A) is a common use of the genitive, the part-from-whole relationship is more specific here. It does not describe a quality (C) or reverse the action (D).