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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explanation:

what are two things that greatly the american economy after the war? the huge buildup of u.s. military the beginning of the korean conflict the creation of the gi bill the marshall plan for nations