When microwaves were new, they often cost over $300, were huge, and had numerous settings and options. brenda and bart waited, concerned about potential health hazards and wishing for more choices in the market. by the time they purchased a microwave, sales of microwaves had leveled off and prices had declined significantly. brenda and bart were part of the diffusion of innovation group.

late majority

Explanation:

According to my research on different types of customers in a market, I can say that based on the information provided within the question Brenda and Bart  were part of the late majority. This term refers to a the final large group of individuals that decide to purchase a new product of adopt a new technology that has been previously offered. Which is what is happening in this scenario since they waited a significant amount of time until there were more products and prices had leveled.

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say it in english maybe we can

you're crazy if you think that someone is going to write a 500 word report for you.