I'm pretty sure (D) is the right answer
A. regulate Calcium status
A and B increase ca levels in blood
C decreases ca levels
hence regulating ca level.
peace.
Answer: Muscular strength
(Hope this helped )
Hi lovely,
The answer you're looking for would be A)
It's important to for these gymnasts to bend their knees slightly before taking the jump; if they don't their knees might lock and that would force them to land and possibly break their legs.