The correct answer is B. She dropped out of school on account of the reality that it was crucial for her to help sustain her family.
Explanation:
In sentences, using words or phrases that are not necessary for the meaning of the sentence should be avoided as this makes sentences to be confusing or unclear. Also, these sentences can be identified because certain phrases or words can be omitted without changing the meaning.
Useless words or phrases occur in "She dropped out of school on account of the reality that it was crucial for her to help sustain her family" because the section "on account of the reality that it was crucial" contains many useless words that make the sentence confusing. Instead, it can be summarized with "because it was crucial" or simply omitted as "She dropped out of school to help sustain her family".