Question

The advice to "keep it simple stupid" suggests that political and other messages should be simple so that the audience will understand the content without distractions. this is an example of which type of processing suggested by the elaboration likelihood model?

Answer 1

it is an example of: Central route processing 

In  elaboration likelihood model central route processing  refers to a set of principle that belief people mostly persuaded solely by the content of the message. 
Advertisers who belief in this term of processing, will create an advertisement that directly tell the good and bad of the product, without any complicated art work or story.