Question

the senate hoped to learn from the watergate tapes
what did the president knew and when he knew it.
who john dean was and when he authorized the break-in.
who the burglars were and why they staged the break-in.
when the watergate break-in occurred and who was involved.

Explanation:

The Senate Watergate Committee's central focus was investigating President Nixon's knowledge and involvement in the Watergate scandal. The famous question "What did the president know, and when did he know it?" became synonymous with the investigation, as the tapes were sought to confirm Nixon's awareness of the cover-up and break-in. The other options are incorrect: John Dean was a key witness who testified about the scandal, the burglars' identities and motives were already known, and the basic details of when the break-in occurred and initial participants were established before the tapes were subpoenaed.

Answer:

what did the president knew and when he knew it.