As soon as he reached there, all the culprits fled away. (make it simple)

A On reaching there, all the culprits fled away.

B In his reaching there, all the culprits fled away.

C At the time of his reaching there, all the culprits fled away.

D On his reaching there, all the culprits fled away.

Correct Answer: Option D

as soon as থাকলে এর পরিবর্তে on বসে। উভয় Clause এর Subject ভিন্ন হলে On এর পর Subject এর Possessive Form + verb+ing বসে।