What device writers encourage readers to form their own interpretations of events in a novel?

A suspenseful open-ending

Explanation:

Typically, when authors want their audience to gauge their own opinions on a work, they'll leave an "open-ending" so they can formulate your own ideas based on the pretense of the story.

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.

it provides a unique and personal perspective on a significant historical event.