To answer this question, we need to understand the story of Karna from Hindu mythology. Karna was a prominent character in the Mahabharata, an ancient Indian epic.
According to the Mahabharata, Karna was the son of Kunti and the Sun God, Surya. When Karna was born, he was abandoned by his mother and was raised by a charioteer. Later, Karna became a skilled warrior and was known for his generosity.
The God who offered the Kavach Kundal (natural armor) to Karna was indeed Suryadev, or the Sun God. As Karna's father, Suryadev bestowed upon Karna a set of divine armor and earrings (Kavach Kundal) to protect him in battle.
Therefore, the correct answer is:
D. Suryadev