The discovery of a series of fossils of human-like skulls from throughout the past 4 million years indicates the process of Punctuated equilibrium. Thus, the correct option is A.
Punctuated equilibrium may be defined as a type of speciation in which most of the time species are stable. But every now and then there is a disruptive event that promotes rapid change.
Gradualism may deal with the idea that evolution occurs at a slow but steady pace. Disruptive selection refers to environmental conditions that change in two different directions. Both of these processes do not make any sense here.
Therefore, the correct option for this question is A.
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