Which code emphasizes loyalty to one’s country?

The emphasis on loyalty to one's country is encapsulated in the concept referred to in the choice that directly mentions loyalty to country. This principle is fundamental in many martial arts philosophies and codes, as it underscores the importance of patriotism and responsibility towards one's nation, which can resonate deeply within the context of a martial arts practice that values honor and integrity.

Honor Friendship highlights the importance of relationships and bonds among practitioners, while No Retreat in Battle signifies a commitment to strength and perseverance in the face of adversity. Obedience to Parents reflects respect and duty towards familial obligations. However, none of these options specifically address the patriotic duty and loyalty to one's homeland, making loyalty to country the one that directly aligns with the original inquiry. Thus, it stands as the correct choice in emphasizing the commitment one should have towards their nation.