Scientists now think about a combination of both gradualism and punctuated equilibrium explains the pace of evolutionary change. Thus, the correct option is C.
What is Evolutionary change?
Evolutionary change may be defined as the process of heritable changes in the organisms of the same species over a gradual period of time due to various evolutionary forces like natural selection, migration, genetic drift, etc.
Gradualism over a long period of time leads to speciation when organisms are reproductively isolated. Punctuated equilibrium may also lead to evolutionary changes over a given period of time. It marked the isolated episodes of rapid speciation.
Therefore, the correct option is C.
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