How Can We Explain the Presence of Extrasolar Planetary Systems

Multiple Choice

How can we explain the presence of extrasolar planetary systems with Jovian-sized planets at distances at which we normally find terrestrial planets?

A) they are brown dwarfs that were captured by their parent stars
B) these are massive terrestrial planets that formed close to their parent stars
C) they are Jovian planets that were spun out from their rapidly spinning parent stars
D) the Jovian planets formed farther out and then migrated inward