1-C. It's time to prove we can win.It's time to prove we can win.
(形式主語:それは)、時間です、証明するダヨ、私たちが勝つことができることをダヨ。
2-C. She wanted to prove to everyone that she was an adult and had stopped listening to others.She wanted to prove to everyone that she was an adult and had stopped listening to others.