D. He measures his self-worth by his status as lower middle class.
Answer: He questions his selfworth.
Explanation:
In the story the main conflict for the parents is the situation that the mother wants to go back to the country of Puerto Rico, whilst as the father would rather commit to stay in US, being the father's internal conflict the interrogant of wether or not he would be able to support his family economically and the implications of being part of the lower class in the United States.
