First of all you always develope a strategy no matter what u do so its A
When active in extreme weather you should always mind two things, your outfit and hydration. Keeping yourself hydrated and protected is essential, as wearing a cap and sunglasses can protect you in the sun just like scarves and gloves can protect you in the cold. Hydration is of extreme importance because you can collapse without enough water during a hot weather wave.
Since there are no options listed to choose from, my best guess would be watches, since a lot of apple watch products are now sold with built in heart monitors.
Hello There!
Judging from this the person is most likely anemic. In anemia, oxygenation decreases.
The person has decreased oxygenation of blood.
Hope This Helps You!
Good Luck :)
- Hannah ❤