Answer: Edward gives Tania a present because she is celebrating her birthday
Explanation:
The conversation started with Edward wishing Tania a happy birthday and Tania thanking him. Tania then goes ahead to say that Edward is the first to wish her a happy birthday. After which Edward hands her a birthday present.
Edward gives Tania a present because she is celebrating her birthday.
Presents are usually given out to people celebrating their birthdays.