The Japanese people currently pay about $4$ times the world price for rice. If Japan removed its trade barriers so that Japanese consumers could buy rice at the world price, who would make a greater effort lobbying for or against this reduction to trade barriers: Japanese consumers or Japanese rice famers?

a$.$ Japanese consumers would lobby harder since their potential gain as a whole is larger than the potential loss of farmers as a whole.

b$.$ Japanese farmers would lobby harder since their potential loss as a whole is larger than the potential gain of consumers as a whole.

c$.$ Japanese farmers would lobby harder since their losses are concentrated in a smaller group than the gains to consumers.

d$.$ Japanese consumers would lobby harder, since their gains are spread over a larger group than the gains to farmers.