Step 1: Understanding the abbreviation.
UNCITRAL is a legal body associated with the United Nations that works in the field of international trade law.
Step 2: Analyzing the options.
(A) Council: Incorrect — UNCITRAL is not a council.
(B) Commission: Correct — UNCITRAL stands for United Nations Commission on International Trade Law.
(C) Committee: Incorrect term; committee is not used in the official name.
(D) Convention: Incorrect — UNCITRAL is a commission, not a convention.
Step 3: Conclusion.
The full form of UNCITRAL is United Nations Commission on International Trade Law.