Option 1 -> "sizzled" refers to making a hissing sound when burning, not used for describing injury to body parts.
Option 2 -> "scorched" means to burn or char a surface, typically used for fabrics or surfaces, not for liquid burns.
Option 3 -> "scalded" specifically means to burn with hot liquid or steam, which is appropriate for boiling milk.
Option 4 -> "sunburnt" refers to skin damage from sun exposure, irrelevant in this context.
Hence, Option 3: scalded -> "Scalded" is the precise medical term for burns caused by hot liquids or steam, making it the only appropriate choice when describing an injury from boiling milk -> correct