Afood product that has to be imported into a country for that country’s consumption most often becomes
a.
unattainable
b.
exotic
c.
more expensive
d.
less expensive

C. More expensive
Hope it help

It depends on the context of the whole text. With only this sentence, the option would be C, more expensive, as you think about the importation costs, making the product more expensive, but in reality, imported products often are less expensive.

Hope this helps :)