A is correct; B is wrong. "ever", in this sense, can be used in questions and in negative and conditional statements, but not in affirmative statements.
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CliveI wouldn't call it incorrect grammar to repeat 'ever', but it seems archaic and would often sound elaborately poetic. eg I have ever loved you, and shall ever love you ere I die.However, this is a different meaning of "ever": here it means "always", not "at least once".