The correct answer is Primary
Step-by-step explanation:
In both diaries and autobiographies, the author describes his/her experiences. This means in both sources the events are directly described by the person who lives them. This distinctive feature makes both texts to be primary sources or first-hand accounts. Moreover, this type of source differs from secondary or tertiary sources because in this the author did not experience the events but only writes a new text based on other sources. For example, if the diary is summarized, the summary is a secondary source.