The factors that can interfere with a person's ability to express preferences include lack of knowledge about choices, limited communication skills, and staff who do not support those choices. Therefore, the correct option is D. All of the above . Each of these elements significantly influences whether individuals feel empowered to express their preferences.
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The ability to express preferences can be impacted by a lack of knowledge, limited communication skills, and unsupportive staff. Each of these factors plays a significant role in whether individuals feel empowered to voice their choices. Therefore, the correct answer is 'All of the above.' ;