Help Please need correct answer.

A company produces equal numbers of footballs in three different colors. The manager wants to check each kind of football produced for errors. Which of the following is an example of stratified random sampling?

A) Check first 10 footballs of each color.
B) Group the footballs by their color and then randomly check 10 from each group.
C) Group the footballs by their color and then check the first 3 footballs from each
group.
D) Check the 4th football, and then every 5th football of each color