Scientists have found that birds living in large groups have more new neurons and stronger memories than birds living in loneliness. They, therefore, advise humans: You are a lonely person, and you had better make some friends, otherwise you will lose your precious brain cells and lead to memory. Which of the following, if true, would best refute the above view? ['Human brains are fundamentally different from birds.', 'The human brain is much more developed than the bird brain.', 'Many people who make friends have a bad memory.', 'Many lonely people have a very good memory.']