The correct answer is B. Atopic dermatitis.

The hypopigmented patches and thin plaques on the face of this child are most consistent with a diagnosis of pityriasis alba, which is most strongly associated with atopic dermatitis.

Autoimmune conditions, like vitiligo, may be associated with alopecia areata,
but these resulted in depigmented patches. Neurofibromatosis I and Tuberous
sclerosis may be associated with findings of nevus anemicus or nevus
depigmentosus, which is not consistent with the findings shown. Parkinson
disease may be associated with seborrheic dermatitis, but this is not the likely
condition in this patient.

References:

Givler DN, Basit H, Givler A. Pityriasis Alba. [Updated 2023 Feb 19]. In:
StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; 2023 Jan-.
Available from: https://www.ncbi.nlm.nih.gov/books/NBK431061/