He frequently vetoed legislation presented by the Radical Republicans is best describes Andrew Johnson's relationship with the Radical Republicans.
Andrew Johnson was the seventeenth President of the United States, succeeding Abraham Lincoln following his assassination. Johnson was elected to the Democratic Party's ticket as a southerner.
Because of ideological disagreements, the Radical Republicans were opposed to President Johnson's proposals, as he was a Democrat from the southern states.
Thus, option C is correct.
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