What type of natural selection was acting on the lab scenario

Types of natural selection: Different types of natural selection can impact the distribution of phenotypes within a population.In (a) stabilizing selection, an average phenotype is favored.In (b) directional selection, a change in the environment shifts the spectrum of phenotypes observed.In (c) diversifyingselection.

Both prokaryotic and eukaryotic cells have ribosomes and cell membranes