________ is the percentage change in one product's sales due to a percentage change in a marketing variable (such as price) for another product

Only controllable variables can be manipulated in simulation

Indicate whether the statement is true or false

The tendency of Americans to look people in the eye contrasts with the tendency of the British to keep looking away while conversing. Such differences are categorized as ________

A) oculesics B) proxemics C) paralanguage D) object language