The Enzyme Salivary Amylase in the Mouth Breaks Down Starch $\degree$

The enzyme salivary amylase in the mouth breaks down starch into the simple sugar glucose. The mouth has a pH of 7. Salivary amylase will

A) also break down starch in the stomach, which has a pH of 2.
B) be able to break down proteins to amino acids in the stomach.
C) not be able to break down starch in a test tube. It needs to be in the mouth.
D) work at temperatures lower than body temperature (37 $\degree$ C) .