During the general adaptation syndrome, the phase involves the body's attempt to adapt to its high state of arousal as it tries to cope with the stressor.

L believe the answer is: Resistance (Phase II)

Resistance (Phase II) in general adaptation syndrome happen after we finish initial fight-or-flight process in response of the stressful event.
Even though during this process our body has begin adapt to its high state of arousal and get into recovery phase, it would still maintain high level of alertness.