【单选题】

School andEinstein did not mix well. His teachers thought that he was stupid and thatEinstein’s thoughts and words were jumbled(混乱的). His schoolwork was poor. Playing the violin was all he was good at as a chilD、

When he was ten, he metDr. Max Talmy. Talmy talked with the boy and tried to help him. They discussed hooks andEinstein showed an interest in maths. He understood difficult problems and ideas. Inside this "stupid" boy was a genius.
Schoolwork never became easy forEinstein. He could not learn things by heart. Paying attention was hard for him. He even did not pass his first test to enter college.
Because of his learning problems,Einstein made few friends. He was shy in groups of people. Yet he overcome(克服)his shortcomings. He became a well-known scientist in the field of physics. He was one of the most important thinkers of the modern age.
Einstein could not learn things by heart because ______.
A、he was not able to use his head
B、he was not good at anything
C、he spent all his time to play the violin
D、he did not pay any attention to what he was not interested in