Mercury Is a Heavy Metal That Can Cause Severe Health $2012 .$

Mercury is a heavy metal that can cause severe health problems in even small concentrations. Fish and shellfish efficiently concentrate mercury into their flesh, so it is important to monitor seafood for its mercury content.
An extensive study conducted in 1980 concluded that the mean mercury level in oysters from the White Bear estuary was 0.020 parts per million (ppm) with a standard deviation α = 0.036 ppm. In 2012, a sample of 44 oysters from the same estuary exhibited a mean mercury concentration of 0.017 ppm. Can you conclude that the 2012 mercury concentration is lower than in 1980? Use the α = 0.05 level of significance

A) Yes. The mercury concentration appears to be lower in $2012 .$
B) No. There is insufficient evidence to conclude that the mercury concentration has decreased from 1980 to 2012 .
C) There is not enough information to reach a conclusion.