Pediatrician: Child psychologists recommend that mothers of one-year-olds not only name objects in the immediate environment, but that they include the color of the object, when applicable. For instance, if a mother hands her child a red ball, she should say, "This is a red ball. " Nonetheless, even if mothers began to name the color, instead of simply saying, "This is a ball, " no real benefit will be conferred to the child, because studies have shown that children under 18-months old do not grasp the notion of color. The pediatrician's argument is most vulnerable to which of the following?
A: Psychologists have conducted studies showing that most children under the age of 30 months often utter the names of colors even when that color is not present in their environments.
B: Infants who hear words embedded in sentences that have each part of speech present tend to speak sooner than those infants who do not.
C: Children usually benefit from having toys in their environments.
D: The range at which children utter their first sentence typically ranges from 15-months to 30-months.
Choose A, B, C or D as your solution.
B