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To solve this question, the user needs to have some knowledge about the Mahabharata epic and the characters involved in it.

The description given in the question suggests that the character is Bheem's son and had supernatural powers of becoming invisible and changing his size, which were given to him by his mother Hidimba, who belonged to the demon clan (asura). He used his magic to overpower the Kauravas and gave up his life for his uncle Arjun.

Let's go through each option and determine the correct answer:

A. Ashwathama: Ashwathama was the son of Dronacharya and was a great warrior in the Mahabharata. He is known for his role in the Kurukshetra war and for his immortality. However, the description given in the question does not match with the character of Ashwathama.

B. Ghatotkach: Ghatotkach was the son of Bheem and Hidimba, and had the powers of becoming invisible and changing his size. He played a significant role in the Mahabharata war and used his magic to overpower the Kauravas. He sacrificed his life for his uncle Arjun by using his powers to create a diversion in the battlefield. Therefore, option B is the correct answer.

C. Bali: Bali was a character in the Ramayana and was the king of Kishkindha. He had a boon that he could transfer half of his opponent's strength to himself, which made him invincible. The description given in the question does not match with the character of Bali.

D. Karna: Karna was a prominent character in the Mahabharata, who was known for his skills in archery. He was the son of Kunti and Surya, and was raised by a charioteer. The description given in the question does not match with the character of Karna.

Therefore, the correct answer is:

The Answer is: B. Ghatotkach