Glittering and shaking to the strains of "Proud Mary," this lady ruled the stage in the sixties, but Ike ruled the roost until she walked out the door. It took her almost a decade to get back on top but she still remains one of pop's great divas. Closing in on sixty, she can still belt out rock and roll with singers half her age, and "Simply the Best" just may qualify as her own personal theme song.
The person described is
In drawing the appropriate inference, which piece of information is more useful.
a. She ruled the stage but Ike ruled the roost.
b. She was a popular singer in the sixties.