25 POINTS!!!!!!!!!!!!!!!!!!! GET IT RIGHT!!!!!!!!!

Choose the sentence that uses a comma or commas correctly.
Select one:
a. The factory makes doors windows and blinds.

b. Pines, hemlocks, and firs, are all soft woods.

c. The fox ran across streams, through woods, and over meadows.

d. We use our oven for broiling baking, roasting, and warming.