During Hoover's administration, the stock market collapsed. This was such a huge deal because people were borrowing money from the banks and putting in stock market. When the collapse occurred people were unable to repay the banks the money they took out, the banks failed.
From my Knowledge,
If the head of the executive branch e.g. (The President) were subjected to a subpoena, then they have the right to claim executive privilege to withhold information from the other branches.
The to and fro generated by different leaderships in the Byzantine
church being Pro or Anti the veneration of icons really lead to a severe
breakdown in the whole structure of the organization over a long
period. So the best answer that could be given here is option D )The
revolts against Byzantine rulers began, illustrating a severe break in
relations between East and West.
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Your answer is the letter c