In which of the following sentences the word “lest" is correctly used?
AHe worked hard lest he might fail
BHe worked hard lest he may not fail
CHe worked hard lest he should not fail
DHe worked hard lest he should fail
AHe worked hard lest he might fail
BHe worked hard lest he may not fail
CHe worked hard lest he should not fail
DHe worked hard lest he should fail