Why would it matter to American policy makers whether Hol Chi Minh was a communist or a nationalist? How might their preference for one or the other ideology affect their policy making toward Vietnam?

The answer would be advertising.

the imf provides economic advice and loans to developing countries.

economic advice:

policy advice to governments and central banks based on analysis of economic trends and cross-country experiences; research, statistics, forecasts, and analysis based on tracking of global, regional, and individual economies and markets; technical assistance and training to countries improve the management of their economies.

loans:

loans to countries overcome economic difficulties; concessional loans to fight poverty.

these are the goals the fund wants to achive.

The answer is a. mantle