Question

why were the mothers of the plaza de mayo upset with argentinas military government? their children were missing. their children had no schools. their children were hungry. their children had no homes.

Explanation:

The Mothers of the Plaza de Mayo were a group of mothers whose children (many of whom were activists, students, etc.) went missing during Argentina's military dictatorship (the "Dirty War" period). The military government engaged in forced disappearances of people suspected of opposing the regime. The other options (no schools, hungry, no homes) do not relate to the primary reason for their protest against the military government.

Answer:

A. Their children were missing.