In how many different number of ways 3 boys and 4 girls can sit on a bench such that girls always sit together.  Select
A) A)720	B) B)576	C) C)740	D) D)780	E) E)790
576   Option '576'
<result>B</result>
In how many different number of ways 3 boys and 4 girls can sit on a bench such that girls always sit together.