The correct response is:
Thermal energy will flow from the oven into the turkey until they reach equilibrium at 100°C.
When the turkey, initially at 45°C, is placed into the oven at 185°C, thermal energy will flow from the oven into the turkey. Since the oven is a hotter environment than the turkey, the temperature of the turkey will increase until it reaches equilibrium with the surrounding environment, which will be determined by the maximum temperature the oven can provide. However, since the oven is turned off, the temperature will not indefinitely rise beyond the maximum achievable, which is why the equilibrium temperature will balance out at 100°C (as that's the cooking temperature for poultry, before cooling or a race towards room temperature).