Historical Fiction is where the event and the time in it is real probably the mini event in the story or characters in the stories probably are not real or don't exist. World War 2 was a real war and event but certain characters may not have been real.
Science Fiction is fiction but including technological events and science related things. Here there is a battle bewtteen humans and aliens.
Informational is where you give information on a real things and exact showing the information recorded and the facts. Here it is talking about the battle of Hastings 1066. It was a battle between the Normans and English.