a) dipende da te b) sta a te scegliere c) decidi tu d1) la decisione e` tua d2) la decisione e` la tua Some context will help us pick a well suited expression.

Ciao Rominna! As those kind guys showed you, it really depends on the context because there are many different ways of saying this. The more neutral translation would be "fai tu" / "decidi tu". It's kind of similar to Spanish: "como quieras", "depende de ti", "tu decides" (Sorry I don't have Spanish accents on my keyboard)

I would add a few more possible translations to Andrew's suggestions: e) è il tuo / il Suo / il vostro turno f) (ora / adesso) tocca a te / a Lei / a voi