The thin outer shell of Earth is broken into large pieces which is called as tectonic plates. Rift valley is not the event of collision between tectonic plates.
Rift valley is the low land between highlands and mountain ranges created by geographical rift.
These can be formed on both land and deep oceans, where they are made by seafloor spreading process.
It is caused when two tectonic plates moves apart from each other.
Thus, the correct option is D.
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