Option 1 suggests an ethnic conflict between native Red Indian tribes and others, which is incorrect as recent civil strife in Argentina has not been predominantly about ethnic conflicts.

Option 2 correctly identifies the main cause of Argentina`s recent civil strife: an economic crisis due to a significant public debt. The country has been struggling with its economy, leading to social issues and public discontent.

Option 3 implicates controversy over using native languages in schools. However, this has not been a significant cause of civil strife in Argentina recently. The country`s public debates and tensions are centered more around economic and political issues.

Option 4 points to clashes between government troops and secessionist groups. Although there have been sporadic incidents of this type, they have not been the main factor causing civil strife.

Hence, the correct answer is 2, as the economic crisis due to huge public debt has been the primary cause of recent civil disputes breaking out in Argentina.