This Figure Represents a Petri Plate

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