To make it parallel I would say to put it in this format: We can’t go back; to go forward is our only option. This makes the verbs the same.
"Well see if you take a setgrenal over here, you'll see a flipperdonder. Take one more step to the right and see a whalyoa," said the Updondesie.
"Toodlroo is my favorite treat," exclaimed Bingus.
The Updondesie setgrenal at Bingus with a blank expression. "Well, Bingus Gillie, you might want to quex on out of here before you fall into some Toodlroo," quipped the Updondesie and he nudged Bingus over the edge into a never ending river of Toodlroo. He state and he completely ignore the scream kid, "Shall we move on with the bizogig?"
Answer:
c. The dialogue reveals humans' self-interest and their helplessness in the face of external forces.
