Reading and writing can be difficult. Pulling things in large weight can also be difficult for them, hearing can be hard, and they cant memorize nor move as fast.
Thanks for asking.
The answer is b. Careful or C.confident
Usually C.confident
In an experiment testing the effects of a treatment, a comparison grouprefers to a group of units (e.g., persons, classrooms) that receive either no TREATMENT or an alternative treatment.