Figure Represents a Petri Plate

Figure represents a Petri plate.The gray area is where bacteria A is growing,the black area is where bacteria B is growing.The white area is a zone where neither organism is growing.What is the best interpretation of what is observed on the plate?

A) Bacteria B is producing an antibiotic that inhibits the growth of bacteria A.
B) Bacteria A produces a compound that inhibits the growth of bacteria B.
C) Bacteria A grows faster than bacteria B.
D) Bacterial colony B has depleted the nutrients in the area around the colony.
E) No conclusion can be made from this information.