What three topics were discussed at the Teheran Conference ?

Stalin, Churchill, and Roosevelt addressed the issue of Iran's special financial needs during the war, and the possibility of needing aid after the war. The three powers declared to continue to render aid to Iran.

the answer to fill in the blank in this question would be the word resource, it is defined as the money, material or people (since human resource is a very valuable good) that a company or a person has at disposition (meaning they can use the resource as they see fit), to be able to complete a task or achieve a goal.  

according to my calculation, the answer is d.