Final answer:
Penelope attributes the massacre of the suitors to divine intervention, aligning with the ancient Greek belief that gods influenced and directly intervened in human affairs.
Step-by-step explanation:
The explanation Penelope gives for the massacre of the suitors, as mentioned in the question, suggests a belief in divine intervention, where she attributes the killing to the actions of gods rather than mortals. In ancient Greek literature, it is common to see gods playing an integral part in the lives of humans, often wielding influence over events in a way that reflects the inherent beliefs of the society at the time. The suitors' massacre is an example of this intervention, aligning with the notion that the gods could directly punish those who transgressed moral or social codes.
Therefore, Penelope believes some god killed the suitors.