Madame Rammelk will be joining
 us for dinner. She is quite a
 distinguished pianist.
 A. Madame Rammelk, who is quite a
 distinguished pianist, will be joining us for
 dinner.
 B. Madame Rammelk, who is quite a
 distinguished pianist will be joining us for
 dinner.
 C. Madame Rammelk will be joining us for
 dinner, who is quite a distinguished pianist.