The feature that causes a gap in the geological record is Extrusion Option(a) is correct.
Extrusion is known to be as the act of step of extruding or the movement of the magma onto the earth surface through volcano craters and the usual cracks in the earth surface.
Extrusion pours out over the Earth surface in a volcanic eruption easily and this is the reason which causes gap in the geological record easily.
Therefore Option(a) is correct.
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