Current scientific knowledge indicates that the most likely origin of most of Earth's oceans was due to: comets from outer space. release of liquid water from the core. water vapor released from volcanic outgassing. All of these. None of these.

The answer is - water vapor released from volcanic outgassing

Explanation:

The earth's interior contains minerals with hydrogen and oxygen, volcanic eruptions spewed gases from the earth's interior to the atmosphere through a process called Outgassing or Degassing which still continues today. Outgassing is the spontaneous evolution of gas from solid or liquid, degassing / degasification is the deliberate removal of dissolved gas from solid or liquids especially water or aqueous solutions. The continual outgassing or degassing process releases H2O as water vapor into the atmosphere (producing rain - rivers, lakes, oceans), carbon dioxide.

Forces of gravity prevent the water from leaving the planet.