What effect would an isertion or deltion mutation on pancreatic amylase have?

It depends on the placing of the mutation. If the mutation is in a coding area then it may effect function of the amylase by preventing proper folding of the protein or the formation of bonds that hold the protein together, for example a mutation in a cysteine residue may inhibit the formation of a disulphides bond.

The answer would be c

It feels feed the echo system