To answer this question, we need to have knowledge about the characters from the Hindu epic, Ramayana.
Option A) Vibheeshana - This option is incorrect because Vibheeshana was not cursed to sleep for six months at a stretch. He was actually a noble character and the younger brother of Ravana, who eventually sided with Lord Rama.
Option B) Indrajit - This option is incorrect because Indrajit, also known as Meghanada, was not cursed to sleep for six months at a stretch. He was a skilled warrior and the eldest son of Ravana.
Option C) Kumbhakarna - This option is correct. Kumbhakarna, the brother of Ravana, was indeed cursed to sleep for six months at a stretch. He was known for his immense strength and was a significant character in the Ramayana.
Option D) Yoopaksha - This option is incorrect because there is no character named Yoopaksha in the context of Ramayana.
The correct answer is C) Kumbhakarna. This option is correct because Kumbhakarna was cursed to sleep for six months at a stretch.