A consumer is less likely to buy more and more of a product at the same price because of
a) diminishing marginal utility.
b) demand elasticity.
c) the substitution effect.
d) the existence of complementary goods.

explanation:

japan participated in world war i from 1914 to 1918 in an alliance with entente powers and played an important role in securing the sea lanes in the west pacific and indian oceans against the imperial german navy as the member of the allies.