What percentage of children diagnosed with Attention-Deficit/Hyperactivity Disorder are treated with stimulant drugs?

When you provide a reinforcer after each response in backward and forward chaining the outcome of that response becomes a:

a. conditioned stimulus for the next response b. S-delta for the next response c. conditioned reinforcer d. A and C

Memory improves dramatically between five to ten years of age and then again by the age of 18

Indicate whether the statement is true or false