In the Human Copy-Number Variation (CNV) for the AMY1 Gene

In the human copy-number variation (CNV) for the AMY1 gene encoding starch-degrading enzyme, if a homozygous genotype with only one copy of AMY1 in each homologous chromosome produces 1 mg/mL of salivary enzyme, what amount of enzyme would be expected in a heterozygous individual with three copies of the AMY1 gene in one chromosome and two copies of AMY1 in the homologous chromosome?

A) 5) 0 mg/mL
B) 4) 5 mg/mL
C) 3) 5 mg/mL
D) 2) 5 mg/mL
E) 2) 0 mg/mL