Answer:
B. advertising
Step-by-step explanation:
-Publicity refers to generating recognition for a product or business using different forms of communication.
-Advertising refers to the form of communication that is used to promote a product or company.
-Public relations is the communication process that helps to create a connection between a business and the public.
-Trade shows are events in which people that are part of the same industry meet to discuss new trends and products.
According to this, the answer is advertising as Mechanical Engineer charges Indiana Processing for using the magazine to promote its services.