Which one of the following will cause a shift of the NX curve to the right?

It slopes downward because higher Y increases imports, reducing NX:

where $\overline{X}$ is autonomous exports and $m$ is the marginal propensity to import ($m > 0$).

This raises Y, causing a movement along the NX curve to a lower NX (higher imports). No shift.

This raises Y (via multiplier), causing a movement along the NX curve to lower NX. No shift.

This raises autonomous exports ($\overline{X} \uparrow$), increasing NX at every Y:

The NX curve shifts right.

Autonomous imports rise or $m \uparrow$, decreasing NX at every Y. The NX curve shifts left.

The answer is C.
C