I heard that one of your sisters met her match in the spelling bee.
I'm assuming that the underlined word is HER.
The antecedent of the underlined personal pronoun is B.) ONE.
When the antecedent is singular, the pronoun must also be in singular form. When the antecedent is plural, the pronoun must also be in plural form.
In the above sentence, even though "sisters" denote plural in number, the phrase "one of your sisters" signifies that only one and not all your sisters is being discussed. Thus, the use of singular pronoun "her".
“Sometimes in her daydreams, her great love wore the handsome young dictator’s face.”
This excerpt is all about the dictator and how the author’s mother loved him.
I think it might be sentence 4, since it is not relevant to the wooly mammoth's disappearance.
She will have 63 students in total so that would mean you will have 7 groups and 9 students in each group