In how many different number of ways 4 boys and 3 girls can sit on a bench such that girls always sit together?  Select the correct option.
A) 720  B) 730  C) 750  D) 800  E) 900
Option '720'
<result>A</result>
In how many different number of ways 4 boys and 3 girls can sit on a bench such that girls always sit together?