Uranium is mined in Niger to produce electricity. The residents of Niger are concerned because uranium mining produces cancer causing radioactive wastes that enter the groundwater they drink. The table below shows the number of cancer patients in the Niger mining community between 1958 and 1974.


Year Number of cancer patients
1958 9
1962 10
1966 14
1970 46
1974 59

Based on the table, which of these is the most likely year when uranium mining was first done in Niger?
a-between 1958 and 1962
b-between 1962 and 1966
c-between 1966 and 1970
d-between 1970 and 1974