3. The U. S. Constitution grants the Senate the power to a. Approve all decisions by a state
b. Nominate ambassadors to foreign countries
C. Issue pardons to criminals
d. Try impeachment cases like a court

A.

Explanation:

Approve all decisions by a state

The Constitution gives the Senate the power to approve, by a two-thirds vote, treaties made by the executive branch. The Senate has rejected relatively few of the hundreds of treaties it has considered, although many have died in committee or been withdrawn by the president.  Explanation:

b) the confederacy had to pay all union war expenses.

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