Step 1: Understanding the definitions.
- Deaf: A person who cannot hear.
- Dumb: A person who is unable to speak.
- Visionless: A person who is blind or has no vision (not a standard term).
- Lame: A person who is unable to walk properly due to injury or disability.
Step 2: Identify the correct term.
The question asks for the correct term for "one who cannot speak." According to standard English usage, the correct word is "dumb".
Step 3: Conclusion.
The correct answer is (B) dumb, as it correctly refers to a person who cannot speak.