John Is a Professor of Mathematics and He Is Trying

John is a professor of mathematics and he is trying to teach basic algebra to his 10-year-old son.Based on your knowledge of concrete-operational thought,will John find it difficult for his son to acquire this skill at this age?

A) yes, because his son will not think logically about abstractions
B) yes, because his son lacks sufficient capacity of short-term memory
C) no, because his son will have mastered relational logic
D) no, because his son will have mastered the use of internal, symbolic thought