What song should I sing for my Follies audition?

I’m a soprano and Im auditioning for a production of Stephen Sondheim s "Follies" for the part of either Young Sally or Young Phyllis, and I’m wondering what a good audition song would be for these roles. I’m not familiar with the production, and I am trying to find what a good song or type of song would be. any suggestions would be extremely helpful!