Which of the following actions can be considered market abuse due to a dominant position?

The action that can be considered market abuse due to a dominant position is unfair pricing. When a company holds a dominant position in the market, it is expected to engage in fair competition practices. Unfair pricing typically involves setting prices significantly above a competitive level or engaging in pricing practices that exploit consumers, such as predatory pricing where a firm sets low prices to drive competitors out of the market and then increases them once it has achieved dominance. This behavior can distort competition, lead to consumer harm, and is therefore regulated under competition laws.

On the other hand, limiting company growth, reducing product quality, and hiring more employees may not directly involve exploitative pricing strategies. While limiting company growth and reducing product quality could affect market competitiveness, they do not specifically fall under the actions of unfair pricing that would signify market abuse in a dominant position. Hiring more employees does not directly relate to market abuse; in fact, it might improve competition and product offerings.