Roger, an affluent college graduate, buys gadgets on the day of their launch in the market. He reads expert reviews on the Internet, and is not influenced by the opinions of his family and friends while choosing products. Roger is most likely to belong to the category of in the context of diffusion of innovation.

Innovators

Explanation:  

 According to the given question, the Roger is belong to the innovators category on the basis of the given diffusion of innovation context as innovators are one of the divergent thinker.

 The innovators are not influenced by the other opinions about the market products as they search themselves about the specification and the features of the specific products on internet.

The innovators is known as the risk taking users in the market as they first experience the product by buying it and the give any review.

 Therefore, Innovators is the correct answer.  

answer; /// the use of a bank credit card to make purchase;