Based on the context of Sentence 3, what does “scruple” mean?

The meaning of Sentence 3 is that people generally believe Maria's sisters to be as beautiful as she is ("such of their acquaintance as thought Miss Ward and Miss Frances quite as handsome as Miss Maria"). As such, the people do not "scruple," or hesitate, to predict that the sisters will find high-class husbands as well. None of these other choices can be substituted into the sentence to preserve this meaning.