Final answer:
Dante initially feels uncertain about Virgil’s nature but soon realizes that Virgil is there as a guide. The correct answer is A) He believes Virgil is a friend, and Dante accepts Virgil's guidance with respect.
Step-by-step explanation:
When Virgil first appears to Dante in 'The Divine Comedy,' Dante initially is uncertain about Virgil's nature but recognizes him as a shade (a spirit).
As they converse, Dante quickly understands that Virgil is there to help and guide him on his journey. Thus, the correct answer to the question 'What does Dante think when Virgil first appears to him?' is A) He believes Virgil is a friend.
Dante is familiar with Virgil's work and holds him in high esteem, which is why he readily accepts Virgil's guidance.