Charlie's rhabdomyosarcoma is classified as stage 1. Rhabdomyosarcoma is a prevalent malignant tumor in children. According to the TNM classification, a tumor is considered stage 1 when it is at a favorable location such as the eye orbital area, head and neck, genitourinary sites, or bile ducts. At this phase, the tumor's size can change, and it may spread to nearby tissues, but not to distant locations.
I think they can best protect themselves from sun exposure by wearing protective clothing.
A??? I think it's A, but not completely certain xD