Do I need a K3

[JohnCButler]

Box 16 is checked on my K1 indicating I have a K3.

The instructions say to go to line 24 of the K3 where I have US source income in column (a) but everything thing is blank or 0.  I cannot enter US or United States in the "Foreign Country or U.S. Possession" dropdown.

If I leave it as "(not applicable)" the next prompts only ask for columns (b) - (g) where I have no entries.

Is "(not applicable)" the right choice?  Thanks!