The correct answer is A
volcanic eruption
Volcanic eruption is defined as the sudden rush of energy materials such as gas,lava and steam. all the others processes takes a great deal of time. For example decomposition takes a long time. Pond succession is dependent on settling of debris and hence takes a long time. regrowing of a forest after a a volcanic eruption can span several years,especially if indigenous trees are the main tree species.
I think the correct answer from the choices listed above is option A. The first type of cell to differentiate is a neuron. The neurons are cells that process and transmits information through electrical and chemical signals. Hope this answers the question.
