20. This Argentinian served for 20 years in the Spanish army before returning to his homeland to lead the struggle for independence from Spain?

Jose de San Martin was the Argentinian that served for 20 years in the Spanish army before returning to his homeland to lead the struggle for independence from Spain. The correct option among all the options that are given in the question is the third option or option "c". He was born on 25th of February in the year 1778 and died on 17th.