Final answer:
Traditional practices often trigger discord when ideological and cultural loyalties compete with nationalist loyalties, as nationalism can suppress or conflict with cultural identities that cross national boundaries or challenge national homogeneity.
Step-by-step explanation:
When ideological and cultural loyalties compete with nationalist loyalties, the aspect that often triggers discord is c. Traditional practices. Nationalism emphasizes the pride in and devotion to one's nation, sometimes to the exclusion or detriment of other identities and ideologies. An intense emphasis on nationalism can cause a clash with traditional practices, especially when these practices are part of a cultural identity that spans across different national boundaries or challenges the hegemony of the nation-state. This clash is evident in how nationalist movements have often sought to homogenize or suppress cultural practices that are not seen as aligning with the nationalist agenda.
Historical instances where traditional practices have caused discord due to competing loyalties include the separatist movements and the enshrinement of one culture or ethnicity over others. Nationalism, as a politically charged ideology, can incite social exclusion and even warfare when it asserts the superiority of one nation over another. Conversely, cultural practices can act as a focal point for unity among people who share them, regardless of national lines, thus sometimes being at odds with strict nationalist agendas.