She had been given many ideas for the project by the class but used only one. Which of the following corrects this statement for active voice and maintains the same idea?

She had been given many ideas for the project by the class, but she used only one.
She had been given many ideas for the project by the class. She used only one.
The class gave her many ideas for the project. Of them, only one was used.
The class gave her many ideas for the project, but she used only one