Answer:
Dysgraphia
Step-by-step explanation:
Dysgraphia is a learning disability that affects written expression. Dysgraphia includes poor written expression, bad spelling and handwriting.
In the example Terry has no problem at all knowing the answers (understanding concepts), expressing himself (by discussing history with his teacher) but he is unable to write his ideas in paper and his handwriting is difficult to read even for him. Therefore, his difficulties are in his written expression and the term that describes best his condition is Dysgraphia.