Answer:
B. True joy is experienced after difficult battles are won.
Step-by-step explanation:
From the excerpt, we can deduce that the main idea it tries to convey is that "true joy is experienced after difficult battles are won."
This is correct because a closer look at the excerpt, we will discover that the narrator was happy when the questions were over. Also, when the official stamped the papers and said, "Welcome to the United States Of America", it was like a fight has been won which was expressed in Mama's face.
These expressions reveal that there is true joy for the family as they successfully passed the tests (difficult battles) to finally get to the United States.