A.No sooner than he reached the station the train left.
B.No sooner had he reached the station than the train left.✓ Correct
C.No sooner he had reached the station than the train left.
D.No sooner had he reached the station then the train left.
Explanation
The standard construction with 'no sooner' requires inversion (auxiliary + subject) and is followed by 'than' (not 'then'). The correct pattern is 'No sooner + had + subject + past participle + than + clause'. Therefore, 'No sooner had he reached the station than the train left' is grammatically correct. 'Then' indicates time sequence and is incorrect here; the inversion is also necessary.
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