The correct answer is B. Reticulated pigment network.

Typical dermoscopic features of seborrheic keratoses include: milia-like cysts, irregular crypts, fissures/ridges, blue-gray lobules, light brown fingerprint-like parallel structures, fat fingers (the gyri of a cerebriform surface). A reticulated pigment network is not a common feature of seborrheic keratoses. The rest of the answers are common with this condition.

References:

Elgart GW. Seborrheic keratoses, solar lentigines, and lichenoid keratoses. Dermatoscopic features and correlation
to histology and clinical signs. Dermatol Clin 2001; 19(2): 347-357.