Bailey, a boy who displays a mild intellectual disability, is struggling with a word problem about a ...

Bailey, a boy who displays a mild intellectual disability, is struggling with a word problem about a car driving from one point to another. The problem is illustrated with a diagram of the car's route. Which of the following is the most likely reason for Bailey's difficulty with the problem?
 
  a. Bailey is confused by the diagram.
  b. Bailey cannot keep all the facts in his short-term memory long enough to figure out the problem.
  c. Bailey does not know how to generalize the strategies he has learned for solving this kind of math problem to the particular problem before him.
  d. Bailey, like most children with mild intellectual disabilities, has poor iconic memory.