As an Infant,Keith Scored Highly on the Bayley Scale,however as a High

As an infant,Keith scored highly on the Bayley scale,however as a high school student,his IQ is slightly below average.What likely accounts for this discontinuity?

A) His Bayley scores reflect motor skills and his Stanford-Binet scores reflect sensory skills.
B) His Bayley scores reflect abstract skills and his Stanford-Binet scores reflect reasoning skills.
C) His Bayley scores reflect sensory skills and his Stanford-Binet scores reflect abstract skills. 
D) His Bayley scores reflect cognitive skills and his Stanford-Binet scores reflect motor skills.