Correct Answer: B

Rationale: The blue whale (Balaenoptera musculus) is the largest mammal — and indeed the largest animal — ever known to exist, reaching lengths of over 30 meters (98 feet) and weighing as much as 200 tons. This marine mammal is found in oceans around the world and primarily feeds on krill, consuming up to 4 tons daily during feeding season. Despite its enormous size, the blue whale’s diet consists of tiny crustaceans, filtered through baleen plates. Its heart alone can weigh as much as a small car. Conservation efforts are ongoing to protect blue whales from threats like ship collisions and climate change.

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