Read the following context and choose the best option to answer the question.
Context: My aunt has loaned me my maternal grandfather 's journal , which he wrote in as a soldier in World War II . My grandfather was of African American and Native American descent and so fought in a segregated unit . One of the first entries I found was written on D - Day .
Question: Why would the narrator be so impressed with the journal ?
Options: 
- It is from their grandmother .
 - It is from the first integrated military unit .
 - It is from WW1 .
 - It is from their grandfather .


It is from their grandfather .