Correct option is B
Gabapentin, an anticonvulsant, modulates calcium channels and is highly effective for neuropathic pain, unlike NSAIDs or opioids which work poorly.
Explanation of options: (a) ✘ Ibuprofen is effective for nociceptive pain, not neuropathic pain. (b) ✔ Correct; gabapentin is first-line for diabetic neuropathy pain relief. (c) ✘ Morphine works poorly in neuropathic pain and is not first-line due to dependency risk. (d) ✘ Paracetamol is weak and has no role in neuropathic pain.