Which of the Following Is a Research Finding of Instruction

Which of the following is a research finding of instruction and the brain?

A) Intensive instruction in letter-sound combinations is unlikely to have any impact on the functioning of the brains of poor readers.
B) People with ADHD have smaller frontal lobes, basal ganglia, and cerebellums that people without ADHD.
C) There are no significant cultural differences in brain activity evident.
D) Stroke victims are unlikely to benefit from intensive instruction as the brain is unlikely to form new connections.