Oral history refers to the preservation of stories, memories, among others that belong to a community through oral tradition or by transmitting the information from one generation to another. It is believed this type of communication was the main source and technique used by communities to preserve cultural elements especially before writing was developed or in the case of communities that did not develop writing as events, stories, myths and others could not be recorded through writing and this forced members of communities to remember all the information and teaching this to other generations to preserve it. Additionally, nowadays, oral history is also the name of the field that studies the way communities use oral tradition to transmit and preserve valuable information. Therefore, it was the oral history of the technique that was used to preserve stories about the past before the development of writing.
The sentence which is the most subjective is D. My mother had to be the best cook in the world. It is subjective because that is your own opinion - the other examples are just facts.
