Many Researchers Have Wondered Why Dolphins Have Brains Comparable in Size

Many researchers have wondered why dolphins have brains comparable in size with those of humans, considering that nature creates organs according to need. Dolphins produce various types of sounds, including clicks, burst-pulse emissions, and whistles. Jack Kassewitz of SpeakDolphin.com, based in Miami, Florida team's findings suggest the large dolphin brain is necessary for the acquisition and utilization of a sono-pictorial language. These findings seem to contradict chimp studies which indicate that chimps

A) can learn and understand sign language like humans do.
B) lack universal grammar and take longer to learn language.
C) performance is similar to an 8 ½ month human child.
D) cannot learn any types of language at all.