If 4 persons can do 4 times of a particular work in 4 days, then, 7 persons can do 7 times of that work in?	Select:
A) 3 days	B) 4 days	C) 6 days	D) 7 days	E) 8 days
That is, 1 person can do one time of the work in 4 days.   Therefore, 7 persons can do 7 times work in the same 4 days itself   4 days)
<result>B</result>
If 4 persons can do 4 times of a particular work in 4 days, then, 7 persons can do 7 times of that work in?