In april of 2012, the centers for disease control and prevention announced that birth rates for u. s. teenagers reached historic lows. from 2009 to 2010 the rate declined 9%, to a level of 34.3 births per 1000 women aged 15–19. which of these conclusion is an example of extrapolation in this context?

a) there was a decreasing trand in teenage birth rates at the time of this study.

b) time is an explanatory variable in the change of teenage birth rates.

c) by 2014, teenage birth rates willl be 36% lower and set new records.

d) there is a linear relationship between year and teenage birth rates.

e) none of these is an example of extrapolation.