With no explanation, label text_A→text_B with either "DON'T KNOW", "NO" or "YES".
text_A: Apollo played a pivotal role in the entire Trojan War. He sided with the Trojans, and sent a terrible plague to the Greek camp, which in a roundabout way led to the conflict between Achilles and Agamemnon. He killed the Greek heroes Patroclus, Achilles, and numerous Greek soldiers. He also helped many Trojan heroes, the most important one being Hector. After the end of the war, Apollo and Poseidon together cleaned the remains of the city and the camps.
text_B: Was causing a rift between Achilles and Agamemnon likely a major factor in Apollo's decision to side with the Trojans?
NO.