How does the matter-of-fact tone contribute to the overall story
a. it creates tension in the story
b. it creates a realistic feeling
c. it creates excitement
d. it creates a sense of mystery

I would say that the answer is B. It creates a realistic feeling.

B. It creates a realistic feeling.

Explanation:

When writing a story, making a point consists on comunicating something that is said or  stated, expressing a particular fact or idea of something that had been proven to be true,  thus making the declarations feel real, creating a realistic reading evironment.

the switch in narration increases the proximity of the narrator to the main character and the reader can perceive information only through the filter of a single character.