Amarching band with 75 members makes two rectangle or marching formations one rectangle six rows the other rectangles nine rows

The rectangle with 6 rows has 30 people in the whole rectangle.  The rectangle with 9 rows has 45 people.

6 x 5 =30

9 x 5 =45

30+45 =75 people

Ithink it’s b because it say 3 plastic rings and all the balls