The statement that is correct here is:
The United States had to stop all postwar loans meant to assist Britain in
rebuilding from war damage.
Explanation:
The US had emerged out the first world war as an industrialized state than it was before and because the war was not fought on the American turf they were also able to escape the brunt of its damage.
Thus it was the US that was giving the loans to the countries that needed to rebuild in the time of the crisis.
This was something that had to stop during the recession.
The American economy could not keep up with the needs of the loans and thus they had to let the loans be foregone and it hurt the economies depending on them further.