answer: The best opening sentence would be C) Sibling rivalry can creep into even the most peaceful families.
explanation:
Good opening sentences hook in and grab reader's attention. Sentences a and options band a are both a little bland, and unexciting. These sentences don't come across as interesting, so they would not be good options to chose. This leaves us c and d. Between these two, C is the best option because it captures reader's attention, and can best lead into more paragraphs, where as D might be interesting, it would be harder to build a paragraph or sentence off of.
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