Finger or hair since its not multipule choice
The root word which means "red" is a. erythr/o.
Just think about biology - you should know that red blood cells are called erythrocytes, where you can obviously see that root word.
Leuk/o refers to white color, and the other two options do not refer to colors at all.
There are differences between having a sprained muscle in the ribs, or a broken rib. A broken rib tends to be more painful, may or may not protrude and can cause extreme swelling and bruising. A muscle strain will have bruising, swelling and pain but it will not protrude and will be less severe.
