In the Process of Planetary Formation, When Would the Inward

In the process of planetary formation, when would the inward migration of Jupiters have been most likely?

A) Shortly after all of the planets had finished forming
B) Just after the system was cleared of the remaining gas
C) Before these planets had grown to full size
D) After these planets had reached full size, but before terrestrial planets had finished forming
E) At least hundreds of millions of years after planetary formation ended