Natural selection is a fundamental concept in evolution that explains how certain traits become more or less common in a population over time. It is a process that occurs in nature and is driven by the environment and the fitness of individuals within a population. There are several types of natural selection, each with its own impact on the population.

The given options include stabilizing selection, directional selection, disruptive selection, and technical selection. Among these, the one that is not included in natural selection is option 'D', which is technical selection.

Technical selection is not a recognized or commonly used term in the field of biology or evolutionary science. It does not describe a specific mechanism or process in nature. Therefore, it cannot be considered as a valid form of natural selection.

To understand the other types of natural selection mentioned in the options, let's explore them in more detail:

1. Stabilizing selection: In stabilizing selection, the average phenotype in a population is favored, while extreme variations are selected against. This type of selection leads to a reduction in genetic diversity and the maintenance of the population's current characteristics.

2. Directional selection: In directional selection, individuals with a particular phenotype that is advantageous in a given environment have a higher fitness and survival rate compared to others. Over time, this leads to a shift in the population towards the favored phenotype.

3. Disruptive selection: Disruptive selection occurs when individuals with extreme phenotypes at both ends of the spectrum have higher fitness compared to individuals with intermediate phenotypes. This can lead to the formation of two distinct phenotypic clusters within a population.

In conclusion, natural selection is a process that drives evolution and is responsible for the changes in traits within a population. While stabilizing selection, directional selection, and disruptive selection are all valid forms of natural selection, technical selection is not a recognized term in the field of biology.