|Question 7Verbal

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Why do black-footed cats purr but leopards roar? Researchers hypothesize that this difference between the two feline species may be partly due to a U-shaped bone in their throats called the hyoid. Black-footed cats, which are much smaller than leopards, have a rigid hyoid that rumbles when the cat's larynx vibrates, resulting in a purr. By contrast, leopards have a somewhat flexible hyoid, and the bone is attached to the skull with a stretchy ligament that black-footed cats lack. These traits allow leopards and most other species of big cats to produce powerful roars. The same traits may also prevent most big cats from purring.
Which choice best states the main idea of the text?
Both black-footed cats and leopards have U-shaped hyoid bones, but black-footed cats' hyoids are rigid whereas leopards' hyoids are flexible.
A
Leopards and most other species of big cats can roar because they have flexible hyoid bones that are attached by stretchy ligaments to their skulls.
B
Researchers are uncertain why relatively small cats, such as black-footed cats, purr but relatively large cats, such as leopards, roar.
C
Differences related to the hyoid bone in black-footed cats and leopards may help explain why one species purrs and the other roars.
D