Final answer:
The correct answer is a) Pain and small. ALS carries information for pain and has small receptive fields.
Step-by-step explanation:
The correct answer is a) Pain and small. ALS, which stands for Anterolateral System, carries information for pain and has small receptive fields. This system is responsible for transmitting pain, temperature, and crude touch sensations from the skin to the brain. It is important for our perception and awareness of pain.