Context: As a boy , I could never understand why my father was reluctant to talk about his military service . He was hardly a shy man . And he loved this country and would and did kill its enemies .

Question: As a boy , why could I never understand why my father was reluctant to talk about his military service ?
Options:
0. Because he killed his country 's enemies .
1. None of the above choices .
2. Because it 's a difficult thing for a child to understand .
3. Because he was a shy man .
Answer: 2