This type of learning, however, is called conditioning. The animal simply learns that when

it performs a particular behavior, it gets a reward, usually a fish. Many animals, including rats, birds, and even invertebrates, can be conditioned to perform. tricks. We certainly dont think of these animals as our mental rivals. Unlike most other animals, however, dolphins quickly learn by observations and may spontaneously imitate human activities. One tame dolphin watched a diver cleaning an underwater viewing window, seized a feather in its beak, and began imitating the diver—complete with sound effects! Dolphins have also been seen imitating seals, turtles, and even water-skiers.

The word "tempted" in the passage is closest in meaning to

A．conditioned

B．reluctant

C．inclined

D．invited