Some customers are , caring about new developments in their category and seeking out new products.

Early adopters

Explanation:

Early adopters define to adopt a new product or technology introduced in the market place for the first customers or the new customers

Here the product or technology is the first time introduced in the market with a lot of expectations which could be in terms of sales, revenues, trust, satisfaction, etc

Therefore in the given situation, the early adopters should be chosen for the new developments in the products category

the third answer is correct.

u = 30

continuing your method

= +

subtract from both sides

= - thus

= -

= ⇒ u = 30