17. If, under perfectly competitive conditions, a small foreign country imposes a tariff of 10 on a good exported by the domestic country, the optimal reaction of the domestic country should be to:

(a) to impose a tariff smaller than 10 on a good exported by the foreign country if the domestic country is small

(b) to impose a tariff larger than 10 on a good exported by the foreign country if the domestic country is large

(c) to impose a tariff larger than 10 on a good exported by the foreign country if the domestic country is large

(d) to impose a tariff smaller than 10 on a good exported by the foreign country if the domestic country is large

(e) none of the above