Final answer:
The correct answer is 'None of the above.' Characteristics of childhood retinoblastoma typically include a white pupil reflection and possibly other signs of eye distress, but not sunburst patterns or Codman's triangle.
Step-by-step explanation:
The characteristics of childhood retinoblastoma do not include a sunburst pattern or Periosteal elevation (Codman's triangle). These two features are associated with other conditions. A sunburst pattern is typically seen in conditions like osteosarcoma, whereas Codman's triangle can be seen in osteosarcoma as a reaction of the periosteum to the presence of a tumor. Childhood retinoblastoma often presents with a white reflection in the pupil known as leukocoria, and may also include symptoms such as crossed eyes (strabismus), poor vision, a red and irritated eye, and in advanced cases, a noticeably different colored iris or an eye that appears larger than normal due to glaucoma.