If this is a true or false answer the answer is FALSE.
Hope this helped :)
False.
Using birth control may be affective for whom are in there twenties or older because, there bodies have already fully developed and the have a normal cycle.
Teen's that use birth control have a higher chance of getting pregnant because, there bodies aren't mature or is there cycle. This is why it's false.
In many cases females become pregnant even when on birth control, birth control can't prevent pregancy most of the time. It's not rare for a feamle on birth control to get pregnant.
Rotating teams more frequently is an example of Modifying the rules of the game to keep things fair.
Your answer would have to be Modifying the rules (Option B.)
I don’t know the exact word but, I has something to do with persisting or trying on I’m not sure if it’s right but, that’s what u can think of atm;)