I choose other too, as both possibilities listed were good options, but I doubt they were enough by themselves. It probably would have taken a combination of events to push the US to war.
Hitler was generally too aggressive, and bit off more than he could chew, since it is rare for a change of personality (a leopard changing its spots) it is likely Hitler would have stuck to this course of action and eventually provoked the US or would have declared war on them for some alleged wrong. Heck, Hitler didn’t change his strategy even when hunkered down in the bunker at the end.
US aid to England and Russia was already flowing, something Hitler already considered an act of war, and US warships and German U-Boats were already shooting at one another, and losses were being taken. Its not to hard to see that this was a recipe for war. Cooked up in Washington and even perhaps Berlin.
Remember, most Europeans (and Hitler was a huge Euro-centrist) still considered the US not a formidable power in 1939, 1940, 1941 etc…And frankly we weren’t. We had potential but not actual proven strength in 1941. They viewed our success in WW1 as us arriving with new fresh troops after they the Europeans had fought the war and were simply worn out from the effort. Even the Brits and the French felt this way in 1918. Heck, whose planes, artillery and equipment did we have to use? Germany certainly wasn’t shaking in its boots when we declared war in 1917.
Hitler was part of that generation and believed the Us would enter the war at some point, his policy was simply to delay that entry. At some point he probably would have changed that policy.