Which did president carter refuse to do in his attempt to free american hostages taken by iran?

Explanation:

1st  President Carter's refused to  immediately deliver an ultimatum to Iran  His  response was to request  the release of the hostages on humanitarian grounds.

2nd  He canceled the rescue attempt of the hostages because of the breakdown of several helicopters.  However while the helicopters were refueling one crashed resulting in the death of 9 people - 8 military and 1 civilian

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.