Identify the enzymes at $A$ and $B$ which hydrolyze the substrates.
Proteins $\xrightarrow{ A }$ $\begin{array}{c}\text{peptones} \\ + \\ \text{proteoses}\end{array}$ $\xrightarrow{ B }$ polypeptides

• A
  $A$-pepsin; $B$-chymotrypsin
• B
  $A$-trypsin; $B$-pepsin
• C
  $A$-trypsin; $B$-chymotrypsin
• D
  $A$-pepsin; $B$-trypsin