When trying officials who have been impeached by the House of Representatives 1. the Senate conducts the impeachment trial
2. the Senate committee acts as prosecutor
3. the president pro tempore presides over the trial
4. the Senate has the power to convict with a three-fourths vote

help me please :)

Which statement best represents an economic weakness of the national government under the articles of confederation? a. the national government was unable to collect taxes. b. national and state taxes combined were too high for most services to pay. c. congress set different tax rates for each state, leading to conflict. d. state refused to collect taxes on behalf of the national government