Which symbol does zeus send to odysseus as an omen?

Omens are or foreshadows of future events which as any symbol is up to conventions and particular interpretations.

When Zeus sends down a Thunderbolt across a clear sky and Odysseus reads that as the signal he was asking for, to know he was meant to come home, which helps him regain his courage, the omen is seen by Eurycleia who reads it as the defeat of the greeedy suitors.

Explanation:

b is the answer.   i sat on the lumpy sofa, totally exhausted, with a bad taste in my mouth, wondering what i should do next.  

the climax is the highest peaking point of the movie it is mostly near the end of the movie where the main characters point of view changes. it is the most excting action part of the movie