Answer:
what I think it is in my opinion is D
The Constitution provides that an amendment may be proposed either by the Congress with a two thirds majority vote in both the House of Representatives and the Senate or by a constitutional convention called for by two thirds of the State legislatures.
Boats and railroads were improved with the use of steam power.
Now I'm not 100% sure here but C is your best bet
Kim II-Sung invaded South Korea. He informed both the Soviet Union and China since they were his allies.