What is the feminine singular form of they?

Personal pronouns are pronouns that are mainly associated primary with a grammatical person, either the first person, second person or third person. The third person personal pronouns are divided in two categories, the singular and the plural. The singular forms of the personal pronouns of the third person are the pronouns "he", "she" and "it". The plural forms of the personal pronouns of the third person are "they" and "them".

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i think its c or d, its been awhile since i read this book