What is the sentence correct? had left no sooner vs. had not left sooner

[Nhatanh]

The robber........the bank than someone rang the alarm.

a. had left no sooner
b. had not left sooner
c. had no sooner left
d. no sooner had left

What is the sentence correct? C?

Thanks.

[Mister Micawber]

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Yes.
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Native English teacher at Mister Micawber's