According to the elaboration likelihood model, the route involves factors such as the source’s attractiveness or the emotional power of an appeal.

Peripheral Route.

Explanation:

The Elaboration Likelihood Model is a model whose goal is to explain different ways in which the brain processes stimuli, why they are used, and how they affect attitude changes. According to my research on the Elaboration likelihood model, I can say that based on the information provided within the question the route that is being defined is called the Peripheral Route.

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  b.

there are isolated pockets of farming, generally around rivers and oases, which are used for irrigation.