To answer this question, we need to understand the story of Bheema and his encounters with various Rakshasas.
In the Mahabharata, Bheema is known for his strength and prowess. One of his notable encounters is with a Rakshasa in the town of Ekachakra. The Rakshasa that Bheema killed in Ekachakra is Bakasura.
Option A) Vanasura - This option is incorrect because Vanasura is not the Rakshasa that Bheema killed in Ekachakra.
Option B) Bakasura - This option is correct. Bheema killed Bakasura in Ekachakra. Bakasura was terrorizing the town and devouring all the food supplies. Bheema, with his immense strength, fought and killed Bakasura, saving the town from his tyranny.
Option C) Vrajasura - This option is incorrect because Vrajasura is not the Rakshasa that Bheema killed in Ekachakra.
Option D) Banasura - This option is incorrect because Banasura is not the Rakshasa that Bheema killed in Ekachakra.
The correct answer is B) Bakasura. Bheema killed Bakasura in Ekachakra to save the town from his terror and hunger.