Seven-year old Sam lags behind his peers in terms of his motor development. Sam walked much later than his peers. Presently, Sam has great difficulty with hand-writing, buttoning his shirt and tying his shoes. Furthermore, Sam is very uncoordinated when he engages in physical activity. What kind of learning disability does Sam have? a. auditory processing disorder b. dyscalculia c. dyspraxia d. dyslexia