Who among the following initiated Ganga dynasty in Odisha?

Anantavarman Chodagangadev (Option B) is the ruler who initiated the Ganga dynasty in Odisha. He is known for his significant contributions to the region, including the construction of the famous Jagannath Temple in Puri.

Raja Rajadeva-I (Option A) was a later ruler and not the initiator of the Ganga dynasty in Odisha.

Vajarahasta-V (Option C) is not historically associated with the Ganga dynasty in Odisha.

Kamarnava (Option D) is also not known as the initiator of the Ganga dynasty in Odisha.

So, the correct answer is Option B: Anantavarman Chodagangadev.