Answer:
C. Trickery is a valuable weapon in battle
Step-by-step explanation:
Because Odysseus tells Polyphemus that his name is Nohbdy, when Polyphemus calls for help in order to get the so called Nohbdy, the other cyclopes think that he is saying "Nobody hurt me". Since nobody did anything, they believe not to be able to help and tell Polyphemus to pray.
If Odysseys hadn't tricked Polyphemus, maybe the other cyclopes would be chasing him and his crew.