My mother upset the kettle of boiling water and . . . . . . . her right hand badly.

The correct answer is D. Scalded.

To scald is to burn or injure with hot liquid or steam. The other options are not as accurate.

• Wounded means to injure someone or something physically.
• Sizzled means to make a hissing sound when heated.
• Scorched means to burn or char the surface of something.

In this case, the mother’s right hand was badly burned by hot water, so the correct answer is D. Scalded.