Which sentence has a verb tense shift error?
a) morgan answered her cell phone in her usual snarky voice.
b) everyone needs to line up outside the door to go playing outside.
c) the stack of water bottles at the dance suddenly crashed to the floor.
d) every single student in the classroom fell asleep before the movie was over.

The excerpt from "Fish Cheeks", by Amy Tan, that is most clearly an example of conflict is B. "And then, they arrived...not worthy of existence."  A conflict is a struggle between opposing forces. The narrator is fourteen, she has a crush on the Minister's son, but she doesn't want him to know it, so she pretends he is not worthy of existence.