The correct option is B. Stubborn is a word in the sentence that has the same meaning as the word obstinate. To be obstinate, dogged, stubborn, or mulish is to refuse to alter one's course or give up one's beliefs or plans. The word "obstinate" is frequently used negatively and connotes unreasonable perseverance.
Obsessed is undoubtedly negative since it suggests a type of hard-headed resolve not to change your views even when it might be beneficial to reconsider your viewpoint. While being stubborn may have positive or negative meanings, being obstinate is most definitely negative.
Thus, In the passage, His sisters are equally as stubborn about getting what they want, no matter how impossible or challenging it may seem these lines clear the meaning of obstinate more clearly. When you criticize someone for being obstinate, you are referring to their strong desire to follow through on their plans and refusal to be persuaded otherwise.
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