Q:

Which of the following options best combines the two given sentences?
 They had finished their dinner. They went to bed.

• 1
  As soon as they had finished their dinner, they went to bed.
• 2
  No sooner they finish their dinner they went to bed.
• 3
  No sooner did they finish their dinner then they went to bed.
• 4
  Before finishing their dinner they went to bed.