Ответ:
C) Barely had the film started when the phone rang.
Конструкция barely ... when означает «едва ... как» и требует инверсии: Barely had + подлежащее + Participle II.
C) Barely had the film started when the phone rang.
Конструкция barely ... when означает «едва ... как» и требует инверсии: Barely had + подлежащее + Participle II.