Answer:
Focus
(first option listed)
Explanation:
In this story, we can see Justin trying to help Becky calm down to get her thinking straight.
We know that "can't concentrate" is what Justin is trying to help with, so "concentrating" essentially means thinking straight/logically.
In this scenario, we could also describe "thinking straight" as being focused, so it is a synonym for concentrate
(note: synonyms are words that mean the same thing)
hope this helps! let me know if you need further clarification :)