"Ann's young son suffers from allergies and complains about his watery eyes and sneezing. When Ann saw an ad for a new drug that counters these symptoms in Martha Stewart Living magazine, she planned to ask his doctor about this product on her son's next visit. Ann is at which stage in the hierarchy of effects

The answer is the cognitive stage.

Explanation:

The hierarchy of effects is broken down into three major parts, cognitive, affective and conative strategies. They involve awareness and knowledge of a product, then liking and preferring the product and lastly actually buying the product.

As we can understand from the example, she saw the ad in a magazine and is thinking about asking to his doctor about it so she is aware of the existence of the drug, which puts her in the cognitive stage.

I hope this answer helps.