Concept:The Alvars were Tamil poet-saints in South India who focused their devotion on Lord Vishnu.
Explanation:The word Alvar means "one who is deeply immersed in the experience of God."
These saints sang songs of longing, ecstasy, and service, all directed towards Vishnu.
Tradition mentions 12 Alvars, who came from all social backgrounds.
The Shaiva counterpart, saints devoted to Shiva, are called Nayanars.
Therefore, Alvars are specifically associated with devotion to Vishnu.
Answer:A. Vishnu