The correct answer is: A. Argentina
Argentina won the 2016 Davis Cup Tennis Tournament, defeating Croatia in the final. Argentina won the tie 3-2, with Juan MartÃn del Potro winning the decisive fifth match.
Switzerland, Serbia, and Croatia were all eliminated in the quarterfinals.
Option A: Argentina
Argentina won the 2016 Davis Cup Tennis Tournament, defeating Croatia in the final. Argentina won the tie 3-2, with Juan MartÃn del Potro winning the decisive fifth match.
Option B: Switzerland
Switzerland was eliminated in the quarterfinals of the 2016 Davis Cup Tennis Tournament, losing to Argentina.
Option C: Serbia
Serbia was eliminated in the quarterfinals of the 2016 Davis Cup Tennis Tournament, losing to Croatia.
Option D: Croatia
Croatia lost to Argentina in the final of the 2016 Davis Cup Tennis Tournament.
Option E: None of the above/More than one of the above
None of the above options are correct. Argentina won the 2016 Davis Cup Tennis Tournament, defeating Croatia in the final.