After experiencing a loss, it's important to take care of yourself by maintaining your physical health - C. You didn't really write the whole part of the answer C, but it's most likely that the physical health is something that should be maintained after someone loses somebody else.
<span>Microsleeps </span>are sudden, unexpected moments of sleep that last 4-5 seconds. You should sleep well before you drive a car for example. As you can travel a long distance during microsleep
Oxidative stress is an imbalance between free radicals and antioxidants. Free radicals are molecules that contain oxygen with an uneven number of electrons. Antioxidants are responsible for giving the free radical an electron to stabilize it and make it become less reactive. Our bodies can be exposed to oxidative stress through radiation from the ultraviolet light. It can be exposed through cigarette smoke. As well as being exposed through pollution in the air and water.