A、It is shorter. B、It is much longer. C、It is misunderstood. D、It is thoroughly studied. A由女士所说的“a report said the average human

M: Can you stay focused for the full six minutes? Sounds easy? Maybe not, because today we’ re talking about our attention spans: are they shrinking?
W: Yes, a report said the average human attention span has fallen to just eight seconds.
M: Can that be true? Goldfish reportedly have an attention span of nine seconds. Human attention span is now shorter than that of a goldfish?
W: Yes. Smartphones, the internet, social media—these all certainly do take up a lot of our attention.
M: OK, but some psychologists said for someone distracted by their smartphone or wanting to quickly Google something, it doesn’ t mean that they don’ t have the ability to control and sustain their attention when they carry out another task.
Q13: What is the main topic of the conversation?
Q14: What can we learn about the average human attention span when compared with a goldfish?
Q15: What did the psychologists say about some smartphone users?