In the Lock-And-Key Model of Enzyme Action,the Enzyme Active Site

In the lock-and-key model of enzyme action,the enzyme active site is thought of as ________.

A) a rigid,nonflexible shape that fits the substrate exactly
B) an area of the enzyme that can adjust to fit the substrate shape
C) a key-like shape that fits into a pocket of the substrate surface
D) a hydrophilic area on the enzyme surface
E) a lock that bars a noncompetitive inhibitor from reacting