On what grounds did Nixon refuse to turn over tapes during his presidential scandal? O He did not know where they were.
They could be damaging to him.
- They had all been erased,
He cited executive privilege.

Answer

I'm not 100% sure what the answer is but after reading the explanation I hope you can get your answer I'm sorry. It MIGHT be the last one. Cited executive privilege.  

Explanation:

President Nixon initially refused to release the tapes, for two reasons: first, that the Constitutional principle of executive privilege extends to the tapes and citing the separation of powers and checks and balances within the Constitution, and second, claiming they were vital to national security

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answer; /// i do believe that the correct answer is (a); a farming tribe that settled primarily along the mississippi and arkansas rivers;