Who is the Argentine author who was persecuted by the military dictatorship and won the Hans Christian Andersen award?

A Argentine author won the Hans Christian Andersen award in 1976.
The author's book 'Un elefante ocupa mucho espacio' was banned by the military dictatorship.
The author's works have been published in various countries in Latin America and Europe, as well as in Israel, the United States, and Japan.
The book 'Un elefante ocupa mucho espacio' was published in 1975.
Elsa Bornemann
Mónica Pironio
Delia Méndez
Nora Leone