What was the purpose of the party-nominating conventions, which were started during the Jacksonian era (A. to give more people a say in choosing candidates)
(B. To present new techniques for promoting candidates)
(C. To debate important economic and political issues)
(D. To increase the voting rights of the common people)
(E. To address problems faced by American Indians)

a or d

Explanation:

but i think a

in mcculloch v. maryland (1819) the supreme court ruled that congress had implied powers under the necessary and proper clause of article i, section 8 of the constitution to create the second bank of the united states and that the state of maryland lacked the power to tax the bank.

gibbons v. ogden, (1824), was a landmark decision in which the supreme court of the united states held that the power to regulate interstate commerce, granted to congress by the commerce clause of the united states constitution, encompassed the power to regulate navigation.