Final answer:
Note pads, letter boards, and picture boards are tools that facilitate communication. A magnifying glass is not a communication tool, but rather a visual aid.
Step-by-step explanation:
Tools that assist in communication include: A. Note pad, B. Letter boards, and C. Picture boards. These tools are specifically designed to facilitate dialogue or transmit messages between individuals. They can be particularly useful for those who have difficulties with verbal communication. A note pad allows for written communication, letter boards can help spell out words, and picture boards use visuals to represent concepts or needs. The fourth option, D. A magnifying glass, is not primarily a communication tool; it is used to enlarge small text or objects for easier viewing and is typically associated with tasks requiring visual aid rather than communication.