What Do These Products Have in Common-Soy Sauce,yogurt,Swiss Cheese,and Buttermilk

Multiple Choice

What do these products have in common-soy sauce,yogurt,Swiss cheese,and buttermilk?

A) All four are modified dairy products.
B) Antibiotic therapy often depresses the intestinal bacterial flora; any of the four can be used to reestablish those bacterial colonies.
C) Each is one of the better sources of protein for individuals choosing a meatless diet.
D) The production of each involves bacterial fermentation.