What changes occur in a females estrogen level during puberty

Its a bit hard to explain BUT
 
The increased levels of sex hormones  result in physical changes some of them , including maturation of the breasts, and other places that im not gonna say. Normally, these changes occur sequentially during puberty, resulting in sexual maturity whic hmost ppl think only boys have but most girls do to . ...
Genetics can cause , Puberty to happen  earlier in girls whose mothers matured early. so it could be earlier then teenage years depending on when the mother started

The answer would be d. most contraceptives are effective when used properly