We only have the stats for teenage pregnancies. We do not have the statistics for sexual activity of those who do and do not drink. There is a difference between sexual activity and teenage pregnancies.
Teenage pregnancies will still occur even if there was stricter control on alcohol sale to young people. However, we cannot assume that the teenage pregnancies will be fewer or more.
We do not know how many girls have consumed alcohol before the age of 16. We only know that 40% of teenage girls who became pregnant had consumed alcohol.
None of the statements are correct. So, D is the answer.