When was Black Sabbath's debut studio album released?
1970
1970
1968
1970
1968
1970
1968
1970
1968
1970
1968
1970
1969
1972
1968
1967
1970
1969
1972
1968
1973
1967
1970
1969
1972
1968
1973
1975
1967
1970
1969
1972
1968
1973
1975
1967
1970
1969
1972
1968
1973
1975
1967
1970
1969
1972
1968
1973
1975
1971
1967
1970
1969
1972
1968
1973
1975
1971
1967
1970
1969
1972
1968
1973
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1974
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1974
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1974
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1966
1974
1975
1971
1967
1964
1970
1969
1972
1965
1968
1973
1966
1974
1975
1971
1967
1964
1969
1972
1965
1976
1973
1966
1974
1975
1971
1960
1963
1967
1964
1969
1972
1965
1976
1973
1966
1974
1975
1971
1960
1963
1967
1964
1969
1972
1965
1976
1973
1966
1974
1975
1977
1971
1960
1963
1967
1964
1969
1972
1965
1976
1970.
1968.
1969.
1967.
1973.
1975.
1972.
1965.
1971.
1970.
1968.
1969.