Final answer:
The minimum outdoor air temperature for start and takeoff should be above 0°C.
Step-by-step explanation:
In order to determine the minimum outdoor air temperature (OAT) for start and takeoff (T/O), we need to consider the freezing point of water. The freezing point of water is 0°C or 32°F. So, any temperature below 0°C would be considered too cold for start and T/O.
Options (a), (b), and (c) all have temperatures above 0°C, so they are not the correct answers. Therefore, the correct answer is option (d) 'None of the above', as none of the given temperatures are below 0°C.