Approximately 0% of children under the age of 1 use smart devices. The Option D is correct.
Most children under age 1 can not use the device due to the fact that infants lack the physical and cognitive development necessary to interact with smart devices effectively. At this age, their motor skills are not sufficiently developed to manipulate touchscreens or other device interfaces and their cognitive abilities are still in the early stages of development.
The pediatric experts also recommend limiting screen time for children under the age of 2 to promote healthy physical and cognitive development which further supports the notion that very few, if any, infants are using smart devices.
Instead, children at this age typically rely on more traditional forms of interaction and stimulation, such as human interaction, toys and sensory experiences, to aid in their early development.