Which of the following is a skin disorder that can arise from poor nutrition?

Poor nutrition can significantly affect the condition of the skin and contribute to the development of various skin disorders. All the conditions listed—acne, eczema, and psoriasis—can indeed be exacerbated or influenced by nutritional factors.

Acne, for instance, can be affected by dietary choices, such as the intake of high-glycemic foods that may lead to increased insulin levels and subsequently more oil production in the skin. Nutritional deficiencies, particularly in vitamins A, E, and those in the B complex, can also impact skin resilience and healing.

Eczema, or atopic dermatitis, can be triggered or worsened by food allergies or sensitivities, as well as inadequate essential fatty acid intake. Maintaining proper nutrition helps to strengthen the skin barrier and reduce inflammation associated with eczema.

Psoriasis is another skin condition linked to immune system function and inflammation. Nutritional deficiencies, particularly in omega-3 fatty acids and antioxidants, may play a role in exacerbating the inflammation seen in psoriasis.

Given that all three conditions can arise from or be worsened by poor nutrition, the most comprehensive and accurate answer, indicating the interconnectedness of these skin disorders with dietary habits, is indeed "all of the above."