(1) researchers at six flags marine world, in california, were observing young bottlenose dolphins as they blew bubbles under water. the dolphins sometimes made bubble rings by expelling air through their blow holes. as a bubble ring rose in the water, a dolphin would bat it with a fin. then, before the ring reached the surface, the dolphin would bite the ring to pop it. (2) the dolphins’ behavior made the scientists wonder whether dolphins could plan ahead. the scientists think that this might be true. if a dolphin’s first ring was well formed, the dolphin was more likely to make a second ring. the two rings usually combined to make a large ring that seemed even more fun to bat and bite. if the first ring was poorly formed, though, the dolphin would not bother to make another one. it was as though the dolphin were saying, “why bother? ”

which information from paragraph 2 could be omitted without changing the meaning of the selection?

a. if the first ring was well formed, a dolphin often blew another one.
b. the larger ring seemed to be more fun to bat and bite.
c. scientists think that dolphins may plan ahead.
d. the dolphin seemed to say, “why bother? ”