The Statements, "The Pound Sterling Is to London What the Brazilian

The statements, "The Pound Sterling is to London what the Brazilian Real is to Rio de Janeiro," "Fahrenheit is to the USA what centigrade is to Europe," and "A fox is to a chicken what a cat is to a mouse," all rely on which type of reasoning?

A) Causal chain
B) Contingent generalization
C) Parallel case
D) Contributory cause