Answer :

the answer is b. "read to the end"
It makes intuitive sense and is the only solution that is correct in terms of the grammar. 

The correct answer is option b. "Read to the end". In order to really understand a difficult chapter, it is important to not skip any section of the chapter, and it is important to read it to the end. Most of the time difficult chapters contain a lot of information and it is important to read all the content in order to completely understand it.

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