Who has the power to authorize the spending of federal
funds? *

In the federal government of the United States, the power of the purse is vested in the Congress as laid down in the Constitution of the United States, Article I, Section 9, Clause 7 (the Appropriations Clause) and Article I, Section 8, Clause 1 (the Taxing and Spending Clause).

Explanation:

yup! you are correct it is b.

it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.