. Why is it important to include a variety of sentence types in your writing? to show context

to write objectively

to persuade readers

to add interest

a

explanation:

because i the point in view is between characters

i think the correct answer is b. phrase

sentence lenght varies according to word choice.you select which word to use and that will require to use other expressions that collocate with the word chosen.sentence length will vary   according to the choice of words you make to express your ideas.