The options are not given. However, a breakdown of the early stage processes of the formation of ocean basin by sea floor spreading is explained below.
The early stage of the formation of ocean basin is usually called the classed as THE EMBRYONIC and JUVENILE stages.
- Ocean basins are usually a result of plate movement at divergent plate boundaries. The process of the earth's tectonic plates moving away from one another at mid oceanic ridges is called SEA FLOOR SPREADING.
- As plates move apart, a gap is created at the point of divergence which is usually lower than the height of the diverging plate sections, this gives rise to the formation of a rift valley which is a lowland region at that point. Example is the East African Rift Valley
- The JUVENILE stage results in the formation of thin and narrow oceanic crust below sea level as the ocean bottom of the diverging plates subsides. Example is the Red Sea.
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