I think D best supports the theme of the text.
The line is an example of a direct quotation. That is when a quotation by someone is unchanged and presented in its entirety. Of course, it's a part of a larger speech, but it's unchanged and can be as such analyzed for various things that the linguists would be searching for.
Answer: A. Someone's child had joined the military
Explanation: The "flag" is a great symbol of the military so it's a hard trick question, assuming that he is grown up by then by the lines "But his country called him man-size." Therefore he is still looked at as a kid they cared for which are his/hers parents.
Answer:
Digital currency has to be regulated. Digital currency has to be accepted by domestic and foreign banks. Digital currency has to be protected and secured by FDIC.
Either add the passage with the question so we know what you are referring to or do not post questions like these. Not everybody has read what you have. This question is completely useless and unanswerable without the story to go off of.