For a long time latin america literature has shown a vigour as in few other literary spheres

The statement is completely true. Even though many records of the pre-colonial period haven been lost, Latin America literature has given great works in a short period of time.

We can see their vigour in the literature about their culture, tradition and history. It is necessary to mention Ricardo Palma with his tradiciones peruanas, Domingo Sarmiento Facundo (shows the dichotomy between civilization and barbarism). This wave of Romanticism brings another great work and that is Martín Fierro (José Hernández), representing the authentic Argentine tradition and culture.

Latin America literature has shown its vigour in many revolutionary minds. We first think of José Martí (Cuba) and his revolutionary ideas and poetry. Another great fruit of Latin America literature was the creation of the literary movement called Modernismo. It began with Rubén Darío and his book Azul. This is the first literary movement originating from this continent.

After that, Latin American authors have been producing original works and movements. Latin American Boom is well-known all over the world (it includes writers such as Jorge Luis Borges, Julio Cortázar, Gabriel García Márquez, etc.). A very close movement that arises in the same literary surrounding is magic realism. This great invention has brought a literature revolution that influenced authors worldwide.

given the fact that the question is about the detail that best support the idea that oppressive leaders use   propaganda to achieve thir goals,   the first option does not refer to any kind of propaganda, since it only tells about that the milk and the windfall apple should be reserved for the pigs. in the second option, that is, "snowball and napoleon sent out flights of pigeons whose instructions were to mingle with the animals on the neighbouring farms, tell them the story of the rebellion, and teach them the tune of "beasts of england". it can be identified that the oppressors make use of the propaganda, which is represented by the pigeons, and the information they have to tell other animals about what was happening in the farm in order to get their objectives. for that reason, the right answer is the second option, taking into account that the third option do not refer to propaganda since it only talks about that they did not want jones back. and, finally, the last option refers to the result of the given news, but it does not mean about the propaganda they used to achieve their goals.

the direction of the magnetic field produced by an electric current will change when the direction of the electric current changes. for example : if a current is flowing in a straight length of wire, the magnetic field is described by a concentric circle (using right-hand rule).