A study found that a couple who are both right-handed had a left-handed child of only about 9.5%. If one of the parents is left-handed, the chance of the child being left-handed rises to 19.5%. If both parents are left-handed, Then the child is left-handed with a 26% chance. Therefore, researchers believe that the left and right-hand use habits are genetically affected. Which of the following is true can weaken the above view:. ['For most animals, the use of a certain side limb seems to be random.', 'Different left-handed usage habits are likely to bring different talents to different people.', 'It is found that once the child develops the habit of using the left or right hand, it is difficult to change it.', 'A study of twins found that 50% of twins are left-handed and one is right-handed.']