Which sentence is correct?

Which sentence is correct?

  1. a) One of my sisters are a nurse
  2. b) One of my sister is a nurse
  3. c) One of my sisters is a nurse
  4. d) One of my sister’s are a nurse

From the BCS General Cadre 2025 – 47th BCS Preliminary (BPSC) exam, question 79 of 180.

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