Step 1: Identify major oil producers.
The world's top oil-producing countries include Russia, the U.S., Saudi Arabia, and Iran, with significant contributions to global output.
Step 2: Evaluate the options.
Option (B) includes Russia, U.S., Iran, China, and Saudi Arabia, covering the top producers, with China also having notable production.
Step 3: Eliminate distractors.
(A), (C), (D), (E) include countries with lower production (e.g., Kazakhstan, Venezuela, Libya) or miss key producers.
Therefore: The correct answer is (B). \[
\boxed{\text{B}}
\]