Questions & Answers about Tu bufanda es roja, pero la mía es verde.
Because tu without an accent is the possessive adjective meaning your.
- tu bufanda = your scarf
Tú with an accent is the subject pronoun meaning you.
- Tú eres alto. = You are tall.
So in this sentence, tu is correct because it describes bufanda.
In Spanish, when you use a possessive pronoun like mine, yours, his, hers, it often comes with the definite article:
Here, la mía means mine, but it literally matches the omitted noun: