This is a test of commonsense with single/multi-choices. Complete the next sentence:

How to cure or alleviate edema
Get moving.
If you sit still for too long, edema tends to worsen, since the fluids sit stagnant in your body's tissues. Getting some light exercises increases circulation and pumps the fluids back toward your heart, helping the swelling go down.

OPT: a). You may even find that sitting in a seated position prevents edema significantly. You may even find that you're pulling out your blackberry's legs when sitting in the same position.. b). By sticking to light exercises during, say, an intense massage, you can positively impact your kidneys. The benefits of moderate to vigorous exercise include: a decreased pain level, decreased swelling, reducing inflammation, reducing blood pressure, and helping prevent heart damage.. c). Go for short walks several times a day to get your blood moving. A 15-30 minute walk several times a day or fast walking, if physically able, can help the swelling go down.. d). Working in a more moderate light exercise can produce the least amount of swelling and increase blood circulation throughout the body. Keep an eye on the temperature in your room..
The answer is:
c).