ATP is produced by cellular respiration in your human body cells. There are a variety of enzymes that work to produce ATP, but one of those enzymes is called phosphofructokinase-1. This enzyme is sensitive to blood acidity. Blood can become more acidic if a patient is in respiratory distress.

Please see below

Explanation:

For a patient suffering from respiratory distress, the increase in blood acidity further effects the functionality of the enzymes. Some variables that have an effect on enzyme function are listed below:

multiple allele inheritance is traits controlled by more than 2 alleles (ex: pigeons having 3 alleles of one gene govern their feather color).   so the answer is a.