To answer this question, we need to understand the relationships in the Mahabharata epic.
Bhishma, also known as Bhishma Pitamah, was the son of King Shantanu and the river goddess Ganga. However, Bhishma had no stepbrothers.
Option A) Santanu - This option is incorrect because Santanu is the father of Bhishma, not his stepbrother.
Option B) Chitrangada - This option is correct because Chitrangada was the son of King Shantanu and Queen Satyavati, who was Bhishma's stepmother. Chitrangada was Bhishma's stepbrother.
Option C) Jujutsyu - This option is incorrect because there is no character named Jujutsyu in the Mahabharata.
Option D) Debabrata - This option is incorrect because Debabrata is another name for Bhishma himself, not his stepbrother.
The correct answer is Option B) Chitrangada. This option is correct because Chitrangada was Bhishma's stepbrother, being the son of King Shantanu and Queen Satyavati.