Afast pace in a narrative creates ' a formal tone a tense mood a sense of sorrow a serious tone

A tense mood.

Explanation:

When the author uses a "fast pace," what this means is that the actions in the story are occurring in quick succession. Therefore, sentences tend to be short and the story moves quickly. This is commonly used when the author wants the reader to be anxious about what is coming next. Therefore, this pace tends to create a tense mood.

the author develops a cold, and scared tone. making the reader shudder with fear, and suddenly become cold. i'm guessing that he's writing a scary novel, or maybe about a chilly december night.