**Answer: D. Vegetative Propagation**

Explanation:

The Hardy-Weinberg equilibrium is a principle in population genetics that states that the genetic frequencies in a population will remain constant from one generation to the next in the absence of certain influences. These influences include:

- Genetic drift
- Gene flow (migration)
- Mutations
- Selection (natural or artificial)
- Non-random mating

Vegetative propagation does not disturb the Hardy-Weinberg equilibrium because:

- **Asexual reproduction:** Vegetative propagation is a type of asexual reproduction where new individual organisms are produced from a single parent without the involvement of sexual reproduction, and therefore, no genetic recombination occurs. As a result, the genetic makeup of the offspring remains identical to the parent, which helps to maintain the genetic frequencies in the population.

- **No gene flow:** Since vegetative propagation does not involve the exchange of genetic material between organisms, there is no gene flow between populations. Gene flow can cause changes in the genetic frequencies of a population and disrupt the Hardy-Weinberg equilibrium.

- **No genetic drift:** Genetic drift is a random change in the genetic frequencies of a population due to chance events. Vegetative propagation produces genetically identical offspring, which prevents random changes in the genetic frequencies and maintains the Hardy-Weinberg equilibrium.

- **No mutations:** Although mutations can occur in any organism, the rate of mutation is generally low, and the impact of mutations on the genetic frequencies of a population is relatively insignificant. Vegetative propagation does not increase the chances of mutations occurring, so it does not disturb the Hardy-Weinberg equilibrium.

In summary, vegetative propagation does not disturb the Hardy-Weinberg equilibrium because it involves the production of genetically identical offspring through asexual reproduction, which helps to maintain the genetic frequencies in a population. This process does not involve gene flow, genetic drift, or increased mutation rates, which are factors that can disrupt the equilibrium.