Other things remaining the same, if a large part of the population decided against having soda for health reasons, this would result in:

a.an increase in the quantity of soda supplied.
b.an increase in the quantity supplied of complements like fries and burgers.
c.a decrease in the price of soda.
d.a rightward shift of the demand curve for soda.
e.a decrease in the quantity demanded of substitutes like mineral water