Assertive people would have all of these attributed except having respect for others - C.
Although even this answer perhaps couldn't be considered true because assertive people can have a positive attitude and respect towards other people it's just that in their case they respect themselves more and have a more positive view of themselves as well.
Answer:
D is the answer to this question
About 59% according to the article in Morbidity and Mortality Weekly Report
Rocking horse (the others use smaller muscles of the hands), larger muscles like the leg are used to rock.