Despite Many Diverging Interests, Argentina and Brazil Were Allies in the Paraguayan

Despite many diverging interests, Argentina and Brazil were allies in the Paraguayan War of 1864-1870

A) to maintain the traditional policy of keeping Paraguay and Uruguay weak
B) to preserve the institution of slavery
C) to maintain good relations with Britain, an important trading partner for both
D) to end the career of Francisco Solano López, whom they considered dangerous