According to Our Present Theory of Solar System Formation, How

According to our present theory of solar system formation, how did Earth end up with enough water to make oceans?

A) The water was brought to the forming Earth by planetesimals that accreted beyond the orbit of Mars.
B) Earth formed at a distance from the Sun at which liquid water happened to be plentiful in the solar nebula.
C) The water was formed by chemical reactions among the minerals in the Earth's core.
D) The water was brought to the forming Earth by planetesimals that accreted near Earth's orbit.