If You Get a Splinter in Your Finger and the Area

If you get a splinter in your finger and the area gets red, swollen, and sore, what is happening?

A) A bacterial infection has defeated your immune system.
B) Your body is producing the inflammatory response to fight and contain any infection.
C) Your body is fighting an infection by concentrating somewhat acidic fluid in the area.
D) Bacteria are rapidly multiplying in the area.
E) By making the area painful, you immune system ensures you don't contaminate it further.