What is the correct definition of narrative nonfiction?
a]it’s a retelling of historical events with alternative outcomes created by the writer to explore the consequences of those outcomes.
b]it blends elements of narration and nonfiction by describing true people and events using plot, characterization, and other techniques common in fiction.
c]it gives readers a glimpse into the lives of heroic personalities from the past, using plot and characterization to highlight the achievements of these individuals.
d]it requires writers to use their imaginations to come up with characters, plot lines, and settings that the readers can identify with.

b. It blends elements of narration and nonfiction by describing true people and events using plot, characterization, and other techniques common in fiction.

faulty parallelism is a construction in which two or more parts of a sentence are equivalent in meaning but not grammatically similar in form.

the correct version of this faulty parallelism in the sentence is:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.

the problem is the last sentence, the first two have a basic subject+verb+object structure.

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in all three sentences:

the hikers knew that the hike was six miles, that it usually required the entire day, and it would not be wise to start after 10: 00 a.m.