Its either B or C.
never the last one, it actually is better to have points from the other side stated in your argument. But then you refute them it helps with your argument.
La gran depresion empezo de la revuelta en 1929
Los americanos fueron los primeros en poner un hombre en la luna
El muro de berlin era un simbolo de la guerra fria
The very first sentence, it explains what happens
