The correct answer is D. Topical glucocorticoids.

The image shows plaque type psoriasis. For mild to moderate disease, topical glucocorticoids are the 1st line therapy.

Narrow-band UBV is the 1st line therapy for moderate to severe psoriasis
Biologic agents are not first line therapy for mild to plaque moderate psoriasis
Acitretin is effective in pustular and palmoplantar psoriasis and less effective as sole therapy for plaque-type psoriasis
Topical glucocorticoids is the correct answer
Methotrexate is not first line therapy for mild to moderate plaque psoriasis

References:

General Dermatology 2.1 Papulosquamous Disorders DIR Review book page 44

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