Question

Which sentence is punctuated correctly?

After running the marathon in record, time, Julia wanted to sleep for the rest of the day.
After running the marathon in record time, Julia wanted to sleep for the rest of the day.
After running, the marathon in record time, Julia wanted to sleep for the rest of the day.
After running the marathon in record time Julia wanted to sleep for the rest of the day.

Answer 1

The second sentence. 

Answer 2

Second sentence.
"After running the marathon in record time, Julia wanted to sleep for the rest of the day."
This is because this is a complex sentence; the first clause "after running the marathon in record time" is a dependent clause, and must be followed by a comma before the independent clause "Julia wanted to sleep for the rest of the day."