Isn't there a subtlety between "only" and "only something"? E.g.,

Only A goes to C, B goes to C: If B goes to C then A goes to C.

Only time when A goes to C, B goes to C: If A goes to C, then B goes to C.

or

Only A funds project C, B funds project C: If B funds project C then A funds project C.

Only projects who are funded by A, are those funded by B: If A funds the project, then B funds the project.

If the "so" were replaced by " for example", would it make A the correct choice?