Answer:
“Children from Central America have been making that journey, often without their parents, for two decades.”
Explanation:
The story constantly talks about the children constantly migrating to safer countries and or to reunite with the family they have left.
Either A or D but I’m thinking more A
"Megan Parker keeps running to check her mailbox, she is waiting for a letter from my cousin."
Correct version
"Megan Parker keeps running to check her mailbox. She is waiting for a letter from her cousin."