6. Which of the following is a common mistake that people make when writing summaries?
A. including supporting details
B. finding the main idea
C. writing their own notes
D. including too little information

The correct answer is D.

Explanation:

All the other options are things you need in a summary so therefore D is the only one that would make sense. Hope this helps!

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.

to persuade readers which is answer c