What was mccarthyism?
a. a tactic of spreading fear with often baseless accusations of communist activities in the united states.
b. a policy of providing economic relief to south korea and other war-torn nations
c. the belief that the united states must save european economies following world war ii
d. the hope that communists would be treated equitably and incorporated into american society

the answer is: must pay taxes on profits

since it is considered as a part of your income, profits from investments is eligible for tax payment.

the tax from your investment could be influenced by how long you decided to sell it. united states promotes keeping your investment for long term period. so, the tax rate for investments that you sell in less than one year is typically higher compared to investments that you sell in more than one year period.